diff --git a/platform/lang-impl/src/com/intellij/codeInsight/lookup/impl/LookupImpl.java b/platform/lang-impl/src/com/intellij/codeInsight/lookup/impl/LookupImpl.java
index bc17e2c3108c..9f877e1a16b6 100644
--- a/platform/lang-impl/src/com/intellij/codeInsight/lookup/impl/LookupImpl.java
+++ b/platform/lang-impl/src/com/intellij/codeInsight/lookup/impl/LookupImpl.java
@@ -264,6 +264,10 @@ public class LookupImpl extends LightweightHint implements LookupEx, Disposable,
     }
   }
 
+  /**
+   * let LookupImpl know that user changed selected element
+   * @see #isSelectionTouched()
+   */
   public void markSelectionTouched() {
     if (!ApplicationManager.getApplication().isUnitTestMode()) {
       ThreadingAssertions.assertEventDispatchThread();