diff --git a/platform/lang-impl/src/com/intellij/codeInsight/daemon/impl/HighlightRangeExtension.java b/platform/lang-impl/src/com/intellij/codeInsight/daemon/impl/HighlightRangeExtension.java
index da97b8fd957c..21cbb6f03911 100644
--- a/platform/lang-impl/src/com/intellij/codeInsight/daemon/impl/HighlightRangeExtension.java
+++ b/platform/lang-impl/src/com/intellij/codeInsight/daemon/impl/HighlightRangeExtension.java
@@ -18,6 +18,7 @@ package com.intellij.codeInsight.daemon.impl;
 
 import com.intellij.openapi.extensions.ExtensionPointName;
 import com.intellij.psi.PsiFile;
+import org.jetbrains.annotations.NotNull;
 
 /**
  * @author yole
@@ -25,5 +26,5 @@ import com.intellij.psi.PsiFile;
 public interface HighlightRangeExtension {
   ExtensionPointName<HighlightRangeExtension> EP_NAME = ExtensionPointName.create("com.intellij.highlightRangeExtension");
 
-  boolean isForceHighlightParents(PsiFile file);
+  boolean isForceHighlightParents(@NotNull PsiFile file);
 }
diff --git a/plugins/ant/src/com/intellij/lang/ant/AntHighlightRangeExtension.java b/plugins/ant/src/com/intellij/lang/ant/AntHighlightRangeExtension.java
index f534a81c2957..e762173c8fbd 100644
--- a/plugins/ant/src/com/intellij/lang/ant/AntHighlightRangeExtension.java
+++ b/plugins/ant/src/com/intellij/lang/ant/AntHighlightRangeExtension.java
@@ -18,13 +18,14 @@ package com.intellij.lang.ant;
 import com.intellij.codeInsight.daemon.impl.HighlightRangeExtension;
 import com.intellij.psi.PsiFile;
 import com.intellij.xml.util.XmlUtil;
+import org.jetbrains.annotations.NotNull;
 
 /**
  * @author yole
  */
 public class AntHighlightRangeExtension implements HighlightRangeExtension {
 
-  public boolean isForceHighlightParents(final PsiFile file) {
+  public boolean isForceHighlightParents(@NotNull final PsiFile file) {
     return XmlUtil.isAntFile(file);
   }
 }