diff --git a/platform/core-api/src/com/intellij/openapi/vfs/VirtualFileManager.java b/platform/core-api/src/com/intellij/openapi/vfs/VirtualFileManager.java
index bb98e161f9da..b751bdaf8507 100644
--- a/platform/core-api/src/com/intellij/openapi/vfs/VirtualFileManager.java
+++ b/platform/core-api/src/com/intellij/openapi/vfs/VirtualFileManager.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2013 JetBrains s.r.o.
+ * Copyright 2000-2014 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.
@@ -168,5 +168,5 @@ public abstract class VirtualFileManager implements ModificationTracker {
 
   public abstract void removeVirtualFileManagerListener(@NotNull VirtualFileManagerListener listener);
 
-  public abstract void notifyPropertyChanged(VirtualFile virtualFile, String property, Object oldValue, Object newValue);
+  public abstract void notifyPropertyChanged(@NotNull VirtualFile virtualFile, @NotNull String property, Object oldValue, Object newValue);
 }
diff --git a/platform/core-impl/src/com/intellij/openapi/vfs/impl/VirtualFileManagerImpl.java b/platform/core-impl/src/com/intellij/openapi/vfs/impl/VirtualFileManagerImpl.java
index 4b3d65a9d203..59f56bd5b79d 100644
--- a/platform/core-impl/src/com/intellij/openapi/vfs/impl/VirtualFileManagerImpl.java
+++ b/platform/core-impl/src/com/intellij/openapi/vfs/impl/VirtualFileManagerImpl.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2000-2013 JetBrains s.r.o.
+ * Copyright 2000-2014 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.
@@ -185,7 +185,7 @@ public class VirtualFileManagerImpl extends VirtualFileManagerEx {
   }
 
   @Override
-  public void notifyPropertyChanged(final VirtualFile virtualFile, final String property, final Object oldValue, final Object newValue) {
+  public void notifyPropertyChanged(@NotNull final VirtualFile virtualFile, @NotNull final String property, final Object oldValue, final Object newValue) {
     final Application application = ApplicationManager.getApplication();
     final Runnable runnable = new Runnable() {
       @Override