diff --git a/platform/lang-impl/src/com/intellij/codeInsight/documentation/DocumentationComponent.java b/platform/lang-impl/src/com/intellij/codeInsight/documentation/DocumentationComponent.java
index 2b57cf81d8fe..eee656c335b2 100644
--- a/platform/lang-impl/src/com/intellij/codeInsight/documentation/DocumentationComponent.java
+++ b/platform/lang-impl/src/com/intellij/codeInsight/documentation/DocumentationComponent.java
@@ -1559,6 +1559,11 @@ public class DocumentationComponent extends JPanel implements Disposable, DataPr
       super("Open as Tool Window");
     }
 
+    @Override
+    public void update(AnActionEvent e) {
+      e.getPresentation().setEnabledAndVisible(myToolwindowCallback != null);
+    }
+
     @Override
     public void actionPerformed(AnActionEvent e) {
       myToolwindowCallback.run();