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-rwxr-xr-xdoc/README.txt8
1 files changed, 7 insertions, 1 deletions
diff --git a/doc/README.txt b/doc/README.txt
index 0de321f..1be180a 100755
--- a/doc/README.txt
+++ b/doc/README.txt
@@ -48,4 +48,10 @@ For 4-colour images it generates bit patterns "00" for colour 0 (default black),
"01" for colour 1 (default red), "10" for colour 2 (default green) and "11" for
colour 3 (default blue).
-The colours used can be controlled by the switches -c0 to -c3.
+The colours used can be controlled by the switches -c0 to -c3. Note that in
+reality anything that is not colour 1, 2 or 3 is treated as colour 0.
+
+4-colour mode assumes that pixels are double width as well (like on the C64).
+To disable that use the -d switch.
+
+# vim: spell