diff --git a/documentation/src/drawing.dox b/documentation/src/drawing.dox
index 8a2e0e940..072e56a66 100644
--- a/documentation/src/drawing.dox
+++ b/documentation/src/drawing.dox
@@ -156,7 +156,7 @@ the current clipping region.
 FLTK manages colors as 32-bit unsigned integers, encoded as RGBI.
 When the "RGB" bytes are non-zero, the value is treated as RGB.
 If these bytes are zero, the "I" byte will be used as an index
-into the colormap. Colors with both RGB set and an index >0
+into the colormap. Colors with both "RGB" set and an "I" >0
 are reserved for special use.
 
 Values from 0 to 255, i.e. the "I" index value, represent