diff --git a/doc/c128.sgml b/doc/c128.sgml
index 95d130608..4df05492f 100644
--- a/doc/c128.sgml
+++ b/doc/c128.sgml
@@ -175,9 +175,12 @@ memory drivers using the VDC memory!
   This driver was written by Maciej Witkowiak. This driver uses the 80 column
   display and features a resolution of 640*480 with two colors and an
   adjustable palette (that means that the two colors can be choosen out of the
-  16 VDC colors).
+  16 VDC colors). The driver requires 64KB VDC RAM.
 </descrip><p>
 
+Note: The colors are translated from definitions in headers to correct VDC values
+so please use definitions or VIC color numbers only. Colors GRAY3 and BROWN are
+missing on VDC and are translated to the two colors missing from VIC palette.
 
 <sect1>Extended memory drivers<p>