diff --git a/platform/lang-impl/src/com/intellij/codeInsight/AutoPopupController.java b/platform/lang-impl/src/com/intellij/codeInsight/AutoPopupController.java
index 88c39803f21b..0d246fbb6e99 100644
--- a/platform/lang-impl/src/com/intellij/codeInsight/AutoPopupController.java
+++ b/platform/lang-impl/src/com/intellij/codeInsight/AutoPopupController.java
@@ -56,6 +56,11 @@ public class AutoPopupController implements Disposable {
    * This doesn't affect other conditions when autopopup is not possible (e.g. power save mode).
    */
   public static final Key<Boolean> ALWAYS_AUTO_POPUP = Key.create("Always Show Completion Auto-Popup");
+  /**
+   * If editor has Boolean.TRUE by this key completion popup would be shown every time when editor gets focus
+   * and the popup wouldn't have advertising text in bottom.
+   * For example this key can be used for TextFieldWithAutoCompletion. (It looks like usual JTextField and completion shortcut is not obvious to be active.)
+   */
   public static final Key<Boolean> ALWAYS_AUTO_POPUP_NO_ADS = Key.create("Always Show Completion Auto-Popup");
 
   private final Project myProject;