diff --git a/platform/platform-impl/src/com/intellij/openapi/editor/impl/EditorImpl.java b/platform/platform-impl/src/com/intellij/openapi/editor/impl/EditorImpl.java
index 0652be8df661..0ec880f080d0 100644
--- a/platform/platform-impl/src/com/intellij/openapi/editor/impl/EditorImpl.java
+++ b/platform/platform-impl/src/com/intellij/openapi/editor/impl/EditorImpl.java
@@ -1,4 +1,4 @@
-// Copyright 2000-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2021 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package com.intellij.openapi.editor.impl;
 
 import com.intellij.application.options.EditorFontsConstants;
@@ -8,6 +8,7 @@ import com.intellij.ide.dnd.DnDManager;
 import com.intellij.ide.lightEdit.LightEdit;
 import com.intellij.ide.lightEdit.LightEditCompatible;
 import com.intellij.ide.ui.UISettings;
+import com.intellij.internal.statistic.service.fus.collectors.UIEventLogger;
 import com.intellij.openapi.Disposable;
 import com.intellij.openapi.actionSystem.*;
 import com.intellij.openapi.actionSystem.ex.ActionManagerEx;
@@ -3957,6 +3958,7 @@ public final class EditorImpl extends UserDataHolderBase implements EditorEx, Hi
         final FoldRegion range = myGutterComponent.findFoldingAnchorAt(x, y);
         if (range != null) {
           final boolean expansion = !range.isExpanded();
+          UIEventLogger.EditorFoldingIconClicked.log(expansion, e.isAltDown());
 
           int scrollShift = expansion ? 0 : visualLineToY(yToVisualLine(y)) - getScrollingModel().getVerticalScrollOffset();
           getFoldingModel().runBatchFoldingOperation(() -> {
diff --git a/platform/statistics/src/com/intellij/internal/statistic/service/fus/collectors/UIEventLogger.kt b/platform/statistics/src/com/intellij/internal/statistic/service/fus/collectors/UIEventLogger.kt
index 4ec0598e3860..41487cb4fcd1 100644
--- a/platform/statistics/src/com/intellij/internal/statistic/service/fus/collectors/UIEventLogger.kt
+++ b/platform/statistics/src/com/intellij/internal/statistic/service/fus/collectors/UIEventLogger.kt
@@ -1,4 +1,4 @@
-// Copyright 2000-2021 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
+// Copyright 2000-2021 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license that can be found in the LICENSE file.
 package com.intellij.internal.statistic.service.fus.collectors
 
 import com.intellij.internal.statistic.eventLog.EventLogGroup
@@ -7,7 +7,7 @@ import com.intellij.internal.statistic.eventLog.events.EventFields
 
 class UIEventLogger : CounterUsagesCollector() {
   companion object {
-    private val group = EventLogGroup("ui.event", 11)
+    private val group = EventLogGroup("ui.event", 12)
 
     @JvmField val NavBarShowPopup = group.registerEvent("NavBarShowPopup")
     @JvmField val NavBarNavigate = group.registerEvent("NavBarNavigate")
@@ -33,6 +33,7 @@ class UIEventLogger : CounterUsagesCollector() {
     @JvmField val ToolWindowsWidgetPopupClicked = group.registerEvent("ToolWindowsWidgetPopupClicked")
     @JvmField val ImplementationViewComboBoxSelected = group.registerEvent("ImplementationViewComboBoxSelected")
     @JvmField val ImplementationViewToolWindowOpened = group.registerEvent("ImplementationViewToolWindowOpened")
+    @JvmField val EditorFoldingIconClicked = group.registerEvent("EditorFoldingIconClicked", EventFields.Boolean("expand"), EventFields.Boolean("recursive"))
   }
 
   override fun getGroup(): EventLogGroup = Companion.group