diff --git a/json/src/com/jetbrains/jsonSchema/impl/JsonSchemaDocumentationProvider.java b/json/src/com/jetbrains/jsonSchema/impl/JsonSchemaDocumentationProvider.java
index bfb0b7a4509d..481f6af5cebf 100644
--- a/json/src/com/jetbrains/jsonSchema/impl/JsonSchemaDocumentationProvider.java
+++ b/json/src/com/jetbrains/jsonSchema/impl/JsonSchemaDocumentationProvider.java
@@ -177,7 +177,7 @@ public class JsonSchemaDocumentationProvider implements DocumentationProvider {
 
   @Nullable
   @Override
-  public PsiElement getDocumentationElementForLookupItem(@NotNull PsiManager psiManager, @NotNull Object object, @NotNull PsiElement element) {
+  public PsiElement getDocumentationElementForLookupItem(PsiManager psiManager, Object object, PsiElement element) {
     if ((element instanceof JsonProperty || isWhitespaceOrComment(element) && element.getParent() instanceof JsonObject) && object instanceof String) {
       return new FakeDocElement(element instanceof JsonProperty ? ((JsonProperty)element).getNameElement() : element, StringUtil.unquoteString((String)object));
     }
diff --git a/platform/lang-api/src/com/intellij/lang/documentation/CompositeDocumentationProvider.java b/platform/lang-api/src/com/intellij/lang/documentation/CompositeDocumentationProvider.java
index 02f4a4444ba2..3b3ef0ed43b6 100644
--- a/platform/lang-api/src/com/intellij/lang/documentation/CompositeDocumentationProvider.java
+++ b/platform/lang-api/src/com/intellij/lang/documentation/CompositeDocumentationProvider.java
@@ -143,7 +143,7 @@ public class CompositeDocumentationProvider extends DocumentationProviderEx impl
   }
 
   @Override
-  public PsiElement getDocumentationElementForLookupItem(@NotNull PsiManager psiManager, @NotNull Object object, @NotNull PsiElement element) {
+  public PsiElement getDocumentationElementForLookupItem(PsiManager psiManager, Object object, PsiElement element) {
     for (DocumentationProvider provider : getAllProviders()) {
       PsiElement result = provider.getDocumentationElementForLookupItem(psiManager, object, element);
       if (result != null) {
diff --git a/platform/lang-api/src/com/intellij/lang/documentation/DocumentationProvider.java b/platform/lang-api/src/com/intellij/lang/documentation/DocumentationProvider.java
index 8b3a9a1e7e35..e108ae12acab 100644
--- a/platform/lang-api/src/com/intellij/lang/documentation/DocumentationProvider.java
+++ b/platform/lang-api/src/com/intellij/lang/documentation/DocumentationProvider.java
@@ -22,7 +22,6 @@ import com.intellij.openapi.extensions.ExtensionPointName;
 import com.intellij.openapi.project.Project;
 import com.intellij.psi.PsiElement;
 import com.intellij.psi.PsiManager;
-import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 import java.util.List;
@@ -91,7 +90,7 @@ public interface DocumentationProvider {
   String generateDoc(PsiElement element, @Nullable PsiElement originalElement);
 
   @Nullable
-  PsiElement getDocumentationElementForLookupItem(@NotNull PsiManager psiManager, @NotNull Object object, @NotNull PsiElement element);
+  PsiElement getDocumentationElementForLookupItem(PsiManager psiManager, Object object, PsiElement element);
 
   /**
    * Returns the target element for a link in a documentation comment. The link needs to use the
diff --git a/platform/lang-api/src/com/intellij/lang/documentation/DocumentationProviderEx.java b/platform/lang-api/src/com/intellij/lang/documentation/DocumentationProviderEx.java
index c28734b99528..50dd1db2fa5d 100644
--- a/platform/lang-api/src/com/intellij/lang/documentation/DocumentationProviderEx.java
+++ b/platform/lang-api/src/com/intellij/lang/documentation/DocumentationProviderEx.java
@@ -46,7 +46,7 @@ public class DocumentationProviderEx implements DocumentationProvider {
   }
 
   @Override
-  public PsiElement getDocumentationElementForLookupItem(@NotNull PsiManager psiManager, @NotNull Object object, @NotNull PsiElement element) {
+  public PsiElement getDocumentationElementForLookupItem(PsiManager psiManager, Object object, PsiElement element) {
     return null; 
   }
 
diff --git a/platform/lang-impl/src/com/intellij/codeInsight/template/impl/LiveTemplateDocumentationProvider.java b/platform/lang-impl/src/com/intellij/codeInsight/template/impl/LiveTemplateDocumentationProvider.java
index 7b03204799b7..ec4063a93eb1 100644
--- a/platform/lang-impl/src/com/intellij/codeInsight/template/impl/LiveTemplateDocumentationProvider.java
+++ b/platform/lang-impl/src/com/intellij/codeInsight/template/impl/LiveTemplateDocumentationProvider.java
@@ -17,7 +17,7 @@ import javax.swing.*;
 
 public class LiveTemplateDocumentationProvider extends AbstractDocumentationProvider {
   @Override
-  public PsiElement getDocumentationElementForLookupItem(@NotNull PsiManager psiManager, @NotNull Object object, @NotNull PsiElement element) {
+  public PsiElement getDocumentationElementForLookupItem(PsiManager psiManager, Object object, PsiElement element) {
     if (object instanceof LiveTemplateLookupElementImpl) {
       TemplateImpl template = ((LiveTemplateLookupElementImpl)object).getTemplate();
       final TemplateImpl templateFromSettings = TemplateSettings.getInstance().getTemplate(template.getKey(), template.getGroupName());
diff --git a/platform/structuralsearch/source/com/intellij/structuralsearch/plugin/ui/StructuralSearchTemplateDocumentationProvider.java b/platform/structuralsearch/source/com/intellij/structuralsearch/plugin/ui/StructuralSearchTemplateDocumentationProvider.java
index 8184cec5988f..3a499ed4d8b6 100644
--- a/platform/structuralsearch/source/com/intellij/structuralsearch/plugin/ui/StructuralSearchTemplateDocumentationProvider.java
+++ b/platform/structuralsearch/source/com/intellij/structuralsearch/plugin/ui/StructuralSearchTemplateDocumentationProvider.java
@@ -17,7 +17,7 @@ import javax.swing.*;
 
 public class StructuralSearchTemplateDocumentationProvider extends AbstractDocumentationProvider {
   @Override
-  public PsiElement getDocumentationElementForLookupItem(@NotNull PsiManager psiManager, @NotNull Object object, @NotNull PsiElement element) {
+  public PsiElement getDocumentationElementForLookupItem(PsiManager psiManager, Object object, PsiElement element) {
     if (object instanceof Configuration) {
       return new ConfigurationElement((Configuration)object, psiManager);
     }
diff --git a/plugins/ant/src/com/intellij/lang/ant/doc/AntDomDocumentationProvider.java b/plugins/ant/src/com/intellij/lang/ant/doc/AntDomDocumentationProvider.java
index 01cd9515ccfc..f0b0493dc541 100644
--- a/plugins/ant/src/com/intellij/lang/ant/doc/AntDomDocumentationProvider.java
+++ b/plugins/ant/src/com/intellij/lang/ant/doc/AntDomDocumentationProvider.java
@@ -37,7 +37,6 @@ import com.intellij.util.xml.DomElement;
 import com.intellij.util.xml.DomTarget;
 import com.intellij.util.xml.reflect.DomChildrenDescription;
 import org.jetbrains.annotations.NonNls;
-import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 import java.io.File;
@@ -254,7 +253,7 @@ public class AntDomDocumentationProvider implements DocumentationProvider {
   }
 
   @Override
-  public PsiElement getDocumentationElementForLookupItem(@NotNull PsiManager psiManager, @NotNull Object object, @NotNull PsiElement element) {
+  public PsiElement getDocumentationElementForLookupItem(PsiManager psiManager, Object object, PsiElement element) {
     return null;
   }
 
diff --git a/plugins/gradle/java/src/documentation/GradleDocumentationProvider.java b/plugins/gradle/java/src/documentation/GradleDocumentationProvider.java
index a0358be60d78..ea2c6f245512 100644
--- a/plugins/gradle/java/src/documentation/GradleDocumentationProvider.java
+++ b/plugins/gradle/java/src/documentation/GradleDocumentationProvider.java
@@ -24,7 +24,6 @@ import com.intellij.psi.PsiFile;
 import com.intellij.psi.PsiManager;
 import com.intellij.psi.PsiMethod;
 import com.intellij.psi.util.PsiTreeUtil;
-import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.jetbrains.plugins.gradle.util.GradleConstants;
 import org.jetbrains.plugins.gradle.util.GradleDocumentationBundle;
@@ -75,7 +74,7 @@ public class GradleDocumentationProvider implements DocumentationProvider {
 
   @Nullable
   @Override
-  public PsiElement getDocumentationElementForLookupItem(@NotNull PsiManager psiManager, @NotNull Object object, @NotNull PsiElement element) {
+  public PsiElement getDocumentationElementForLookupItem(PsiManager psiManager, Object object, PsiElement element) {
     final PsiFile file = element.getContainingFile();
     if (file == null || !FileUtilRt.extensionEquals(file.getName(), GradleConstants.EXTENSION)) return null;
     final String doc = findDoc(element, object);
diff --git a/plugins/groovy/src/org/jetbrains/plugins/groovy/lang/documentation/GroovyDocumentationProvider.java b/plugins/groovy/src/org/jetbrains/plugins/groovy/lang/documentation/GroovyDocumentationProvider.java
index 70499141b34b..88fbf4638a48 100644
--- a/plugins/groovy/src/org/jetbrains/plugins/groovy/lang/documentation/GroovyDocumentationProvider.java
+++ b/plugins/groovy/src/org/jetbrains/plugins/groovy/lang/documentation/GroovyDocumentationProvider.java
@@ -426,7 +426,7 @@ public class GroovyDocumentationProvider implements CodeDocumentationProvider, E
 
   @Override
   @Nullable
-  public PsiElement getDocumentationElementForLookupItem(@NotNull PsiManager psiManager, @NotNull Object object, @NotNull PsiElement element) {
+  public PsiElement getDocumentationElementForLookupItem(PsiManager psiManager, Object object, PsiElement element) {
     if (object instanceof GroovyResolveResult) {
       return ((GroovyResolveResult)object).getElement();
     }
diff --git a/plugins/maven/src/main/java/org/jetbrains/idea/maven/dom/MavenModelDocumentationProvider.java b/plugins/maven/src/main/java/org/jetbrains/idea/maven/dom/MavenModelDocumentationProvider.java
index d4f504911cca..33e658cb7c7c 100644
--- a/plugins/maven/src/main/java/org/jetbrains/idea/maven/dom/MavenModelDocumentationProvider.java
+++ b/plugins/maven/src/main/java/org/jetbrains/idea/maven/dom/MavenModelDocumentationProvider.java
@@ -56,7 +56,7 @@ public class MavenModelDocumentationProvider implements DocumentationProvider, E
   }
 
   @Override
-  public PsiElement getDocumentationElementForLookupItem(@NotNull PsiManager psiManager, @NotNull Object object, @NotNull PsiElement element) {
+  public PsiElement getDocumentationElementForLookupItem(PsiManager psiManager, Object object, PsiElement element) {
     return null;
   }
 
diff --git a/plugins/maven/src/main/java/org/jetbrains/idea/maven/dom/MavenPluginModelDocumentationProvider.java b/plugins/maven/src/main/java/org/jetbrains/idea/maven/dom/MavenPluginModelDocumentationProvider.java
index d6557595d5c5..520464cab9c2 100644
--- a/plugins/maven/src/main/java/org/jetbrains/idea/maven/dom/MavenPluginModelDocumentationProvider.java
+++ b/plugins/maven/src/main/java/org/jetbrains/idea/maven/dom/MavenPluginModelDocumentationProvider.java
@@ -18,7 +18,6 @@ package org.jetbrains.idea.maven.dom;
 import com.intellij.lang.documentation.DocumentationProvider;
 import com.intellij.psi.PsiElement;
 import com.intellij.psi.PsiManager;
-import org.jetbrains.annotations.NotNull;
 
 import java.util.List;
 
@@ -39,7 +38,7 @@ public class MavenPluginModelDocumentationProvider implements DocumentationProvi
   }
 
   @Override
-  public PsiElement getDocumentationElementForLookupItem(@NotNull PsiManager psiManager, @NotNull Object object, @NotNull PsiElement element) {
+  public PsiElement getDocumentationElementForLookupItem(PsiManager psiManager, Object object, PsiElement element) {
     return null;
   }
 
diff --git a/plugins/maven/src/main/java/org/jetbrains/idea/maven/dom/MavenPomXmlDocumentationProvider.java b/plugins/maven/src/main/java/org/jetbrains/idea/maven/dom/MavenPomXmlDocumentationProvider.java
index 350392aeae79..f6e6f8a21563 100644
--- a/plugins/maven/src/main/java/org/jetbrains/idea/maven/dom/MavenPomXmlDocumentationProvider.java
+++ b/plugins/maven/src/main/java/org/jetbrains/idea/maven/dom/MavenPomXmlDocumentationProvider.java
@@ -21,7 +21,6 @@ import com.intellij.psi.PsiElement;
 import com.intellij.psi.PsiFile;
 import com.intellij.psi.PsiManager;
 import com.intellij.xml.util.documentation.XmlDocumentationProvider;
-import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 import java.util.List;
@@ -76,7 +75,7 @@ public class MavenPomXmlDocumentationProvider implements DocumentationProvider {
 
   @Nullable
   @Override
-  public PsiElement getDocumentationElementForLookupItem(@NotNull PsiManager psiManager, @NotNull Object object, @NotNull PsiElement element) {
+  public PsiElement getDocumentationElementForLookupItem(PsiManager psiManager, Object object, PsiElement element) {
     if (!isFromPomXml(element)) return null;
 
     return myDelegate.getDocumentationElementForLookupItem(psiManager, object, element);
diff --git a/plugins/tasks/tasks-core/src/com/intellij/tasks/doc/TaskDocumentationProvider.java b/plugins/tasks/tasks-core/src/com/intellij/tasks/doc/TaskDocumentationProvider.java
index c59dfc32f10a..87d980bc21e1 100644
--- a/plugins/tasks/tasks-core/src/com/intellij/tasks/doc/TaskDocumentationProvider.java
+++ b/plugins/tasks/tasks-core/src/com/intellij/tasks/doc/TaskDocumentationProvider.java
@@ -24,7 +24,6 @@ import com.intellij.tasks.Comment;
 import com.intellij.tasks.Task;
 import com.intellij.xml.util.XmlStringUtil;
 import com.petebevin.markdown.MarkdownProcessor;
-import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 import java.util.Collections;
@@ -71,7 +70,7 @@ public class TaskDocumentationProvider extends AbstractDocumentationProvider imp
   }
 
   @Override
-  public PsiElement getDocumentationElementForLookupItem(@NotNull PsiManager psiManager, @NotNull Object object, @NotNull PsiElement element) {
+  public PsiElement getDocumentationElementForLookupItem(PsiManager psiManager, Object object, PsiElement element) {
     return object instanceof Task ? new TaskPsiElement(psiManager, (Task)object): null;
   }
 
diff --git a/plugins/xpath/xpath-lang/src/org/intellij/lang/xpath/xslt/impl/XsltDocumentationProvider.java b/plugins/xpath/xpath-lang/src/org/intellij/lang/xpath/xslt/impl/XsltDocumentationProvider.java
index f26972a21a55..4f60f592f52e 100644
--- a/plugins/xpath/xpath-lang/src/org/intellij/lang/xpath/xslt/impl/XsltDocumentationProvider.java
+++ b/plugins/xpath/xpath-lang/src/org/intellij/lang/xpath/xslt/impl/XsltDocumentationProvider.java
@@ -195,7 +195,7 @@ public class XsltDocumentationProvider implements DocumentationProvider {
 
     @Override
     @Nullable
-    public PsiElement getDocumentationElementForLookupItem(@NotNull PsiManager mgr, @NotNull Object object, @NotNull PsiElement psiElement) {
+    public PsiElement getDocumentationElementForLookupItem(PsiManager mgr, Object object, PsiElement psiElement) {
         if (object instanceof String) {
             if (psiElement instanceof XmlElement) {
                 final XmlTag tag = PsiTreeUtil.getParentOfType(psiElement, XmlTag.class);
diff --git a/plugins/yaml/src/org/jetbrains/yaml/meta/impl/YamlDocumentationProviderBase.java b/plugins/yaml/src/org/jetbrains/yaml/meta/impl/YamlDocumentationProviderBase.java
index b9467d999e18..b5a1c2ce514c 100644
--- a/plugins/yaml/src/org/jetbrains/yaml/meta/impl/YamlDocumentationProviderBase.java
+++ b/plugins/yaml/src/org/jetbrains/yaml/meta/impl/YamlDocumentationProviderBase.java
@@ -56,7 +56,7 @@ public abstract class YamlDocumentationProviderBase extends AbstractDocumentatio
   }
 
   @Override
-  public PsiElement getDocumentationElementForLookupItem(@NotNull PsiManager psiManager, @NotNull Object object, @NotNull PsiElement contextElement) {
+  public PsiElement getDocumentationElementForLookupItem(PsiManager psiManager, Object object, PsiElement contextElement) {
     if (object instanceof ForcedCompletionPath) {  // deep completion
       return createFromCompletionPath((ForcedCompletionPath)object, contextElement);
     }
diff --git a/plugins/yaml/src/org/jetbrains/yaml/schema/YamlJsonSchemaDocumentationProvider.java b/plugins/yaml/src/org/jetbrains/yaml/schema/YamlJsonSchemaDocumentationProvider.java
index c8617d548d11..1afe32245af3 100644
--- a/plugins/yaml/src/org/jetbrains/yaml/schema/YamlJsonSchemaDocumentationProvider.java
+++ b/plugins/yaml/src/org/jetbrains/yaml/schema/YamlJsonSchemaDocumentationProvider.java
@@ -48,7 +48,7 @@ public class YamlJsonSchemaDocumentationProvider extends DocumentationProviderEx
 
   @Nullable
   @Override
-  public PsiElement getDocumentationElementForLookupItem(@NotNull PsiManager psiManager, @NotNull Object object, @NotNull PsiElement element) {
+  public PsiElement getDocumentationElementForLookupItem(PsiManager psiManager, Object object, PsiElement element) {
     return null;
   }
 
diff --git a/python/src/com/jetbrains/python/console/PydevDocumentationProvider.java b/python/src/com/jetbrains/python/console/PydevDocumentationProvider.java
index f1e20a5acd98..65905172a12a 100644
--- a/python/src/com/jetbrains/python/console/PydevDocumentationProvider.java
+++ b/python/src/com/jetbrains/python/console/PydevDocumentationProvider.java
@@ -25,7 +25,6 @@ import com.jetbrains.python.documentation.PyDocumentationBuilder;
 import com.jetbrains.python.psi.PyElement;
 import com.jetbrains.python.psi.PyReferenceExpression;
 import com.jetbrains.python.psi.PyUtil;
-import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 /**
@@ -34,7 +33,7 @@ import org.jetbrains.annotations.Nullable;
 public class PydevDocumentationProvider extends AbstractDocumentationProvider {
 
   @Override
-  public PsiElement getDocumentationElementForLookupItem(@NotNull final PsiManager psiManager, @NotNull final Object object, @NotNull final PsiElement element) {
+  public PsiElement getDocumentationElementForLookupItem(final PsiManager psiManager, final Object object, final PsiElement element) {
     if (object instanceof PydevConsoleElement){
       return (PydevConsoleElement) object;
     }
diff --git a/xml/dom-impl/src/com/intellij/util/xml/DomDocumentationProvider.java b/xml/dom-impl/src/com/intellij/util/xml/DomDocumentationProvider.java
index c5ffbfb28ebf..086141f855b3 100644
--- a/xml/dom-impl/src/com/intellij/util/xml/DomDocumentationProvider.java
+++ b/xml/dom-impl/src/com/intellij/util/xml/DomDocumentationProvider.java
@@ -21,7 +21,6 @@ import com.intellij.pom.PomTargetPsiElement;
 import com.intellij.psi.DelegatePsiTarget;
 import com.intellij.psi.PsiElement;
 import com.intellij.psi.PsiManager;
-import org.jetbrains.annotations.NotNull;
 
 import java.util.List;
 
@@ -61,7 +60,7 @@ public class DomDocumentationProvider implements DocumentationProvider {
   }
 
   @Override
-  public PsiElement getDocumentationElementForLookupItem(@NotNull final PsiManager psiManager, @NotNull final Object object, @NotNull final PsiElement element) {
+  public PsiElement getDocumentationElementForLookupItem(final PsiManager psiManager, final Object object, final PsiElement element) {
     return null;
   }
 
diff --git a/xml/impl/src/com/intellij/xml/util/documentation/HtmlDocumentationProvider.java b/xml/impl/src/com/intellij/xml/util/documentation/HtmlDocumentationProvider.java
index a79760109f08..54874e84d28f 100644
--- a/xml/impl/src/com/intellij/xml/util/documentation/HtmlDocumentationProvider.java
+++ b/xml/impl/src/com/intellij/xml/util/documentation/HtmlDocumentationProvider.java
@@ -37,7 +37,6 @@ import com.intellij.xml.XmlElementDescriptor;
 import com.intellij.xml.util.ColorSampleLookupValue;
 import com.intellij.xml.util.XmlUtil;
 import org.jetbrains.annotations.NonNls;
-import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 import java.util.Collections;
@@ -262,7 +261,7 @@ public class HtmlDocumentationProvider implements DocumentationProvider {
   }
 
   @Override
-  public PsiElement getDocumentationElementForLookupItem(@NotNull PsiManager psiManager, @NotNull Object object, @NotNull PsiElement element) {
+  public PsiElement getDocumentationElementForLookupItem(PsiManager psiManager, Object object, PsiElement element) {
     PsiElement result = createNavigationElementHTML(psiManager, object.toString(),element);
 
     DocumentationProvider styleProvider = getStyleProvider();
diff --git a/xml/impl/src/com/intellij/xml/util/documentation/XmlDocumentationProvider.java b/xml/impl/src/com/intellij/xml/util/documentation/XmlDocumentationProvider.java
index d9f678d613fe..66d9880f5cb1 100644
--- a/xml/impl/src/com/intellij/xml/util/documentation/XmlDocumentationProvider.java
+++ b/xml/impl/src/com/intellij/xml/util/documentation/XmlDocumentationProvider.java
@@ -316,7 +316,7 @@ public class XmlDocumentationProvider implements DocumentationProvider {
   }
 
   @Override
-  public PsiElement getDocumentationElementForLookupItem(@NotNull final PsiManager psiManager, @NotNull Object object, @NotNull PsiElement element) {
+  public PsiElement getDocumentationElementForLookupItem(final PsiManager psiManager, Object object, PsiElement element) {
 
     if (object instanceof XmlExtension.TagInfo) {
       return ((XmlExtension.TagInfo)object).getDeclaration();
diff --git a/xml/relaxng/src/org/intellij/plugins/relaxNG/RngDocumentationProvider.java b/xml/relaxng/src/org/intellij/plugins/relaxNG/RngDocumentationProvider.java
index 939cacfa374f..402dcf4c5447 100644
--- a/xml/relaxng/src/org/intellij/plugins/relaxNG/RngDocumentationProvider.java
+++ b/xml/relaxng/src/org/intellij/plugins/relaxNG/RngDocumentationProvider.java
@@ -33,7 +33,6 @@ import org.intellij.plugins.relaxNG.model.descriptors.CompositeDescriptor;
 import org.intellij.plugins.relaxNG.model.descriptors.RngElementDescriptor;
 import org.intellij.plugins.relaxNG.model.descriptors.RngXmlAttributeDescriptor;
 import org.jetbrains.annotations.NonNls;
-import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.kohsuke.rngom.digested.DElementPattern;
 
@@ -139,7 +138,7 @@ public class RngDocumentationProvider implements DocumentationProvider {
 
   @Override
   @Nullable
-  public PsiElement getDocumentationElementForLookupItem(@NotNull PsiManager psiManager, @NotNull Object object, @NotNull PsiElement element) {
+  public PsiElement getDocumentationElementForLookupItem(PsiManager psiManager, Object object, PsiElement element) {
     return null;
   }
 
diff --git a/xml/relaxng/src/org/intellij/plugins/relaxNG/compact/RngCompactLanguage.java b/xml/relaxng/src/org/intellij/plugins/relaxNG/compact/RngCompactLanguage.java
index 55c5be469019..aada6617f02e 100644
--- a/xml/relaxng/src/org/intellij/plugins/relaxNG/compact/RngCompactLanguage.java
+++ b/xml/relaxng/src/org/intellij/plugins/relaxNG/compact/RngCompactLanguage.java
@@ -154,7 +154,7 @@ public class RngCompactLanguage extends Language {
 
     @Override
     @Nullable
-    public PsiElement getDocumentationElementForLookupItem(@NotNull PsiManager psiManager, @NotNull Object object, @NotNull PsiElement element) {
+    public PsiElement getDocumentationElementForLookupItem(PsiManager psiManager, Object object, PsiElement element) {
       return null;
     }