diff --git a/Common/ac/gamestructdefines.h b/Common/ac/gamestructdefines.h
index de7b801c0f..cb6212e063 100644
--- a/Common/ac/gamestructdefines.h
+++ b/Common/ac/gamestructdefines.h
@@ -209,9 +209,9 @@ enum GameGuiAlphaRenderingStyle
 // Sprite flags
 // SERIALIZATION NOTE: serialized as 8-bit in game data and legacy saves
 //                     serialized as 32-bit in new saves (for dynamic sprites only).
-// WARNING: whole lower byte was taken by now deprecated flags;
-// should not reuse these bits unless explicitly set a new spritefile format version!
-#define SPF_OBSOLETEMASK    0xFB
+// WARNING: 0x3B bits were taken by now deprecated flags (see SPF_OBSOLETEMASK);
+// should not reuse these bits unless explicitly set a new game data format version!
+#define SPF_OBSOLETEMASK    0x3B
 #define SPF_DYNAMICALLOC    0x04  // created by runtime script
 #define SPF_OBJECTOWNED     0x0100 // owned by a game object (not created in user script)