diff --git a/src/gfx_type.h b/src/gfx_type.h
--- a/src/gfx_type.h
+++ b/src/gfx_type.h
@@ -224,7 +224,7 @@ enum TextColour {
 	TC_BLACK       = 0x10,
 	TC_INVALID     = 0xFF,
 
-	IS_PALETTE_COLOUR = 0x100, ///< colour value is already a real palette colour index, not an index of a StringColour
+	TC_IS_PALETTE_COLOUR = 0x100, ///< Colour value is already a real palette colour index, not an index of a StringColour.
 };
 DECLARE_ENUM_AS_BIT_SET(TextColour)