diff --git a/platform/platform-impl/src/com/intellij/openapi/application/impl/ApplicationImpl.java b/platform/platform-impl/src/com/intellij/openapi/application/impl/ApplicationImpl.java
index 6de889d52422..1160dc20c6ae 100644
--- a/platform/platform-impl/src/com/intellij/openapi/application/impl/ApplicationImpl.java
+++ b/platform/platform-impl/src/com/intellij/openapi/application/impl/ApplicationImpl.java
@@ -110,7 +110,7 @@ public class ApplicationImpl extends PlatformComponentManagerImpl implements App
   private final boolean myIsInternal;
   private final String myName;
 
-  private final Stack<Class> myWriteActionsStack = new Stack<>(); // accessed from EDT only, no need to sync
+  private final Stack<Class> myWriteActionsStack = new Stack<>(); // contents modified in write action, read in read action
   private final TransactionGuardImpl myTransactionGuard = new TransactionGuardImpl();
   private int myWriteStackBase;
   private volatile Thread myWriteActionThread;