diff --git a/python/src/com/jetbrains/python/findUsages/PyClassFindUsagesHandler.java b/python/src/com/jetbrains/python/findUsages/PyClassFindUsagesHandler.java
index 72d52d3a9e49..2e618cd1b4b7 100644
--- a/python/src/com/jetbrains/python/findUsages/PyClassFindUsagesHandler.java
+++ b/python/src/com/jetbrains/python/findUsages/PyClassFindUsagesHandler.java
@@ -32,7 +32,7 @@ public class PyClassFindUsagesHandler extends FindUsagesHandler {
   }
 
   @Override
-  protected boolean isSearchForTextOccurencesAvailable(PsiElement psiElement, boolean isSingleFile) {
+  protected boolean isSearchForTextOccurencesAvailable(@NotNull PsiElement psiElement, boolean isSingleFile) {
     return true;
   }
 
diff --git a/python/src/com/jetbrains/python/findUsages/PyFunctionFindUsagesHandler.java b/python/src/com/jetbrains/python/findUsages/PyFunctionFindUsagesHandler.java
index 0ab8c2c823f1..62bd457b594c 100644
--- a/python/src/com/jetbrains/python/findUsages/PyFunctionFindUsagesHandler.java
+++ b/python/src/com/jetbrains/python/findUsages/PyFunctionFindUsagesHandler.java
@@ -23,7 +23,7 @@ public class PyFunctionFindUsagesHandler extends FindUsagesHandler {
   }
 
   @Override
-  protected boolean isSearchForTextOccurencesAvailable(PsiElement psiElement, boolean isSingleFile) {
+  protected boolean isSearchForTextOccurencesAvailable(@NotNull PsiElement psiElement, boolean isSingleFile) {
     return true;
   }
 
diff --git a/python/src/com/jetbrains/python/findUsages/PyModuleFindUsagesHandler.java b/python/src/com/jetbrains/python/findUsages/PyModuleFindUsagesHandler.java
index 689c77aa644d..50641b85f76b 100644
--- a/python/src/com/jetbrains/python/findUsages/PyModuleFindUsagesHandler.java
+++ b/python/src/com/jetbrains/python/findUsages/PyModuleFindUsagesHandler.java
@@ -49,7 +49,7 @@ public class PyModuleFindUsagesHandler extends FindUsagesHandler {
                                       isSingleFile,
                                       this) {
       @Override
-      public void configureLabelComponent(final SimpleColoredComponent coloredComponent) {
+      public void configureLabelComponent(@NotNull final SimpleColoredComponent coloredComponent) {
         coloredComponent.append(myElement instanceof PsiDirectory ? "Package " : "Module ");
         coloredComponent.append(myElement.getName(), SimpleTextAttributes.REGULAR_BOLD_ATTRIBUTES);
       }