diff --git a/imgui.h b/imgui.h
index 753382aa..e7d50777 100644
--- a/imgui.h
+++ b/imgui.h
@@ -1035,8 +1035,9 @@ enum ImGuiCol_
 
     // Obsolete names (will be removed)
 #ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
-    , ImGuiCol_ChildWindowBg = ImGuiCol_ChildBg, ImGuiCol_Column = ImGuiCol_Separator, ImGuiCol_ColumnHovered = ImGuiCol_SeparatorHovered, ImGuiCol_ColumnActive = ImGuiCol_SeparatorActive
-    , ImGuiCol_ModalWindowDarkening = ImGuiCol_ModalWindowDimBg
+    , ImGuiCol_ModalWindowDarkening = ImGuiCol_ModalWindowDimBg                      // [renamed in 1.63]
+    , ImGuiCol_ChildWindowBg = ImGuiCol_ChildBg                                      // [renamed in 1.53]
+    , ImGuiCol_Column = ImGuiCol_Separator, ImGuiCol_ColumnHovered = ImGuiCol_SeparatorHovered, ImGuiCol_ColumnActive = ImGuiCol_SeparatorActive  // [renamed in 1.51]
     //ImGuiCol_CloseButton, ImGuiCol_CloseButtonActive, ImGuiCol_CloseButtonHovered, // [unused since 1.60+] the close button now uses regular button colors.
     //ImGuiCol_ComboBg,                                                              // [unused since 1.53+] ComboBg has been merged with PopupBg, so a redirect isn't accurate.
 #endif
@@ -1336,7 +1337,7 @@ struct ImGuiIO
     // You can obtain the ImDrawData* by calling ImGui::GetDrawData() after Render(). See example applications if you are unsure of how to implement this.
     void        (*RenderDrawListsFn)(ImDrawData* data);
 #else
-    // This is only here to keep ImGuiIO the same size, so that IMGUI_DISABLE_OBSOLETE_FUNCTIONS can exceptionally be used outside of imconfig.h.
+    // This is only here to keep ImGuiIO the same size/layout, so that IMGUI_DISABLE_OBSOLETE_FUNCTIONS can exceptionally be used outside of imconfig.h.
     void*       RenderDrawListsFnUnused;
 #endif
 
@@ -1476,6 +1477,7 @@ struct ImGuiPayload
 
 //-----------------------------------------------------------------------------
 // Obsolete functions (Will be removed! Read 'API BREAKING CHANGES' section in imgui.cpp for details)
+// Please keep your copy of dear imgui up to date! Occasionally set '#define IMGUI_DISABLE_OBSOLETE_FUNCTIONS' in imconfig.h to stay ahead.
 //-----------------------------------------------------------------------------
 
 #ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
@@ -1483,14 +1485,14 @@ namespace ImGui
 {
     // OBSOLETED in 1.66 (from Sep 2018)
     static inline void  SetScrollHere(float center_ratio=0.5f){ SetScrollHereY(center_ratio); }
-    // OBSOLETED in 1.63 (from Aug 2018)
+    // OBSOLETED in 1.63 (between Aug 2018 and Sept 2018)
     static inline bool  IsItemDeactivatedAfterChange()        { return IsItemDeactivatedAfterEdit(); }
-    // OBSOLETED in 1.61 (from Apr 2018)
+    // OBSOLETED in 1.61 (between Apr 2018 and Aug 2018)
     IMGUI_API bool      InputFloat(const char* label, float* v, float step, float step_fast, int decimal_precision, ImGuiInputTextFlags flags = 0); // Use the 'const char* format' version instead of 'decimal_precision'!
     IMGUI_API bool      InputFloat2(const char* label, float v[2], int decimal_precision, ImGuiInputTextFlags flags = 0);
     IMGUI_API bool      InputFloat3(const char* label, float v[3], int decimal_precision, ImGuiInputTextFlags flags = 0);
     IMGUI_API bool      InputFloat4(const char* label, float v[4], int decimal_precision, ImGuiInputTextFlags flags = 0);
-    // OBSOLETED in 1.60 (from Dec 2017)
+    // OBSOLETED in 1.60 (between Dec 2017 and Apr 2018)
     static inline bool  IsAnyWindowFocused()                  { return IsWindowFocused(ImGuiFocusedFlags_AnyWindow); }
     static inline bool  IsAnyWindowHovered()                  { return IsWindowHovered(ImGuiHoveredFlags_AnyWindow); }
     static inline ImVec2 CalcItemRectClosestPoint(const ImVec2& pos, bool on_edge = false, float outward = 0.f) { (void)on_edge; (void)outward; IM_ASSERT(0); return pos; }
@@ -1511,7 +1513,7 @@ namespace ImGui
     static inline bool  IsMouseHoveringAnyWindow()            { return IsWindowHovered(ImGuiHoveredFlags_AnyWindow); }
     static inline bool  IsMouseHoveringWindow()               { return IsWindowHovered(ImGuiHoveredFlags_AllowWhenBlockedByPopup | ImGuiHoveredFlags_AllowWhenBlockedByActiveItem); }
 }
-typedef ImGuiInputTextCallback      ImGuiTextEditCallback;      // OBSOLETE in 1.63 (from Aug 2018): made the names consistent
+typedef ImGuiInputTextCallback      ImGuiTextEditCallback;    // OBSOLETE in 1.63 (from Aug 2018): made the names consistent
 typedef ImGuiInputTextCallbackData  ImGuiTextEditCallbackData;
 #endif
 
@@ -1539,15 +1541,15 @@ struct ImGuiOnceUponAFrame
 };
 
 // Helper: Macro for ImGuiOnceUponAFrame. Attention: The macro expands into 2 statement so make sure you don't use it within e.g. an if() statement without curly braces.
-#ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS    // Will obsolete
-#define IMGUI_ONCE_UPON_A_FRAME     static ImGuiOnceUponAFrame imgui_oaf; if (imgui_oaf)
+#ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
+#define IMGUI_ONCE_UPON_A_FRAME     static ImGuiOnceUponAFrame imgui_oaf; if (imgui_oaf)    // OBSOLETED in 1.51, will remove!
 #endif
 
 // Helper: Parse and apply text filters. In format "aaaaa[,bbbb][,ccccc]"
 struct ImGuiTextFilter
 {
     IMGUI_API           ImGuiTextFilter(const char* default_filter = "");
-    IMGUI_API bool      Draw(const char* label = "Filter (inc,-exc)", float width = 0.0f);    // Helper calling InputText+Build
+    IMGUI_API bool      Draw(const char* label = "Filter (inc,-exc)", float width = 0.0f);  // Helper calling InputText+Build
     IMGUI_API bool      PassFilter(const char* text, const char* text_end = NULL) const;
     IMGUI_API void      Build();
     void                Clear()          { InputBuf[0] = 0; Build(); }