diff --git a/imgui.cpp b/imgui.cpp
index 0e9ee8276..2567d604d 100644
--- a/imgui.cpp
+++ b/imgui.cpp
@@ -5933,6 +5933,8 @@ bool ImGui::TreeNodeBehavior(ImGuiID id, ImGuiTreeNodeFlags flags, const char* l
     return is_open;
 }
 
+// CollapsingHeader returns true when opened but do not indent nor push into the ID stack (because of the ImGuiTreeNodeFlags_NoTreePushOnOpen flag).
+// This is basically the same as calling TreeNodeEx(label, ImGuiTreeNodeFlags_CollapsingHeader | ImGuiTreeNodeFlags_NoTreePushOnOpen). You can remove the _NoTreePushOnOpen flag if you want behavior closer to normal TreeNode().
 bool ImGui::CollapsingHeader(const char* label, ImGuiTreeNodeFlags flags)
 {
     ImGuiWindow* window = GetCurrentWindow();
diff --git a/imgui.h b/imgui.h
index c894860ec..a3db5b064 100644
--- a/imgui.h
+++ b/imgui.h
@@ -329,7 +329,7 @@ namespace ImGui
     IMGUI_API void          TreeAdvanceToLabelPos();                                                // advance cursor x position by GetTreeNodeToLabelSpacing()
     IMGUI_API float         GetTreeNodeToLabelSpacing();                                            // horizontal distance preceeding label when using TreeNode*() or Bullet() == (g.FontSize + style.FramePadding.x*2) for a regular unframed TreeNode
     IMGUI_API void          SetNextTreeNodeOpen(bool is_open, ImGuiSetCond cond = 0);               // set next TreeNode/CollapsingHeader open state.
-    IMGUI_API bool          CollapsingHeader(const char* label, ImGuiTreeNodeFlags flags = 0);      // if returning 'true' the header is open. user doesn't have to call TreePop().
+    IMGUI_API bool          CollapsingHeader(const char* label, ImGuiTreeNodeFlags flags = 0);      // if returning 'true' the header is open. doesn't indent nor push on ID stack. user doesn't have to call TreePop().
     IMGUI_API bool          CollapsingHeader(const char* label, bool* p_open, ImGuiTreeNodeFlags flags = 0); // when 'p_open' isn't NULL, display an additional small close button on upper right of the header
 
     // Widgets: Selectable / Lists