diff --git a/python/src/com/jetbrains/python/refactoring/rename/RenamePyClassProcessor.java b/python/src/com/jetbrains/python/refactoring/rename/RenamePyClassProcessor.java
index 3b897ace42ea..bf96070f3d09 100644
--- a/python/src/com/jetbrains/python/refactoring/rename/RenamePyClassProcessor.java
+++ b/python/src/com/jetbrains/python/refactoring/rename/RenamePyClassProcessor.java
@@ -20,7 +20,7 @@ import java.util.List;
  */
 public class RenamePyClassProcessor extends RenamePsiElementProcessor {
   @Override
-  public boolean canProcessElement(PsiElement element) {
+  public boolean canProcessElement(@NotNull PsiElement element) {
     return element instanceof PyClass;
   }
 
diff --git a/python/src/com/jetbrains/python/refactoring/rename/RenamePyFunctionProcessor.java b/python/src/com/jetbrains/python/refactoring/rename/RenamePyFunctionProcessor.java
index 41e406618925..877a84c923f1 100644
--- a/python/src/com/jetbrains/python/refactoring/rename/RenamePyFunctionProcessor.java
+++ b/python/src/com/jetbrains/python/refactoring/rename/RenamePyFunctionProcessor.java
@@ -11,6 +11,7 @@ import com.jetbrains.python.psi.PyClass;
 import com.jetbrains.python.psi.PyFunction;
 import com.jetbrains.python.psi.search.PyOverridingMethodsSearch;
 import com.jetbrains.python.psi.search.PySuperMethodsSearch;
+import org.jetbrains.annotations.NotNull;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -21,7 +22,7 @@ import java.util.Map;
  */
 public class RenamePyFunctionProcessor extends RenamePsiElementProcessor {
   @Override
-  public boolean canProcessElement(PsiElement element) {
+  public boolean canProcessElement(@NotNull PsiElement element) {
     return element instanceof PyFunction;
   }
 
diff --git a/python/src/com/jetbrains/python/refactoring/rename/RenamePyVariableProcessor.java b/python/src/com/jetbrains/python/refactoring/rename/RenamePyVariableProcessor.java
index b56ed10e3999..2936169823f8 100644
--- a/python/src/com/jetbrains/python/refactoring/rename/RenamePyVariableProcessor.java
+++ b/python/src/com/jetbrains/python/refactoring/rename/RenamePyVariableProcessor.java
@@ -4,13 +4,14 @@ import com.intellij.psi.PsiElement;
 import com.intellij.refactoring.rename.RenamePsiElementProcessor;
 import com.jetbrains.python.codeInsight.PyCodeInsightSettings;
 import com.jetbrains.python.psi.PyElement;
+import org.jetbrains.annotations.NotNull;
 
 /**
  * @author yole
  */
 public class RenamePyVariableProcessor extends RenamePsiElementProcessor {
   @Override
-  public boolean canProcessElement(PsiElement element) {
+  public boolean canProcessElement(@NotNull PsiElement element) {
     // extension ordering in python-plugin-common.xml ensures that classes and variables are handled by their own processors
     return element instanceof PyElement;
   }