diff --git a/java/java-analysis-impl/src/com/intellij/codeInspection/reference/RefJavaManagerImpl.java b/java/java-analysis-impl/src/com/intellij/codeInspection/reference/RefJavaManagerImpl.java
index 96bb8becf44a..8fe745ca59b6 100644
--- a/java/java-analysis-impl/src/com/intellij/codeInspection/reference/RefJavaManagerImpl.java
+++ b/java/java-analysis-impl/src/com/intellij/codeInspection/reference/RefJavaManagerImpl.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2014 JetBrains s.r.o.
+ * Copyright 2000-2015 JetBrains s.r.o.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -210,7 +210,7 @@ public class RefJavaManagerImpl extends RefJavaManager {
   }
 
   @Override
-  public void removeReference(final RefElement refElement) {
+  public void removeReference(@NotNull final RefElement refElement) {
     if (refElement instanceof RefMethod) {
       RefMethod refMethod = (RefMethod)refElement;
       RefParameter[] params = refMethod.getParameters();
diff --git a/platform/analysis-api/src/com/intellij/codeInspection/lang/RefManagerExtension.java b/platform/analysis-api/src/com/intellij/codeInspection/lang/RefManagerExtension.java
index 12691a0480a8..13ff7e624664 100644
--- a/platform/analysis-api/src/com/intellij/codeInspection/lang/RefManagerExtension.java
+++ b/platform/analysis-api/src/com/intellij/codeInspection/lang/RefManagerExtension.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2009 JetBrains s.r.o.
+ * Copyright 2000-2015 JetBrains s.r.o.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -41,7 +41,7 @@ public interface RefManagerExtension<T> {
 
   void cleanup();
 
-  void removeReference(RefElement refElement);
+  void removeReference(@NotNull RefElement refElement);
 
   @Nullable
   RefElement createRefElement(PsiElement psiElement);
diff --git a/platform/core-impl/src/com/intellij/psi/PsiAnchor.java b/platform/core-impl/src/com/intellij/psi/PsiAnchor.java
index b79a231010c3..f344e76db0b8 100644
--- a/platform/core-impl/src/com/intellij/psi/PsiAnchor.java
+++ b/platform/core-impl/src/com/intellij/psi/PsiAnchor.java
@@ -52,6 +52,7 @@ public abstract class PsiAnchor {
   public abstract int getStartOffset();
   public abstract int getEndOffset();
 
+  @NotNull
   public static PsiAnchor create(@NotNull final PsiElement element) {
     if (!element.isValid()) {
       throw new PsiInvalidElementAccessException(element);
@@ -125,7 +126,7 @@ public abstract class PsiAnchor {
     return elementType instanceof IStubFileElementType && vFile != null && ((IStubFileElementType)elementType).shouldBuildStubFor(vFile);
   }
 
-  public static int calcStubIndex(StubBasedPsiElement psi) {
+  public static int calcStubIndex(@NotNull StubBasedPsiElement psi) {
     if (psi instanceof PsiFile) {
       return 0;
     }