diff --git a/imgui_internal.h b/imgui_internal.h
index a5ca7e64f..e49c63b0d 100644
--- a/imgui_internal.h
+++ b/imgui_internal.h
@@ -594,8 +594,8 @@ struct IMGUI_API ImGuiDrawContext
 struct IMGUI_API ImGuiWindow
 {
     char*                   Name;
-    ImGuiID                 ID;
-    ImGuiWindowFlags        Flags;
+    ImGuiID                 ID;                                 // == ImHash(Name)
+    ImGuiWindowFlags        Flags;                              // See enum ImGuiWindowFlags_
     int                     IndexWithinParent;                  // Order within immediate parent window, if we are a child window. Otherwise 0.
     ImVec2                  PosFloat;
     ImVec2                  Pos;                                // Position rounded-up to nearest pixel
@@ -637,8 +637,8 @@ struct IMGUI_API ImGuiWindow
     ImGuiStorage            StateStorage;
     float                   FontWindowScale;                    // Scale multiplier per-window
     ImDrawList*             DrawList;
-    ImGuiWindow*            RootWindow;
-    ImGuiWindow*            RootNonPopupWindow;
+    ImGuiWindow*            RootWindow;                         // If we are a child window, this is pointing to the first non-child parent window. Else point to ourself.
+    ImGuiWindow*            RootNonPopupWindow;                 // If we are a child widnow, this is pointing to the first non-child non-popup parent window. Else point to ourself.
 
     // Focus
     int                     FocusIdxAllCounter;                 // Start at -1 and increase as assigned via FocusItemRegister()