docs: describe ANSI 256-color mode

Our color specifications have supported the 256-color ANSI
extension for years, but we never documented it.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/config.txt b/Documentation/config.txt
index 6ae4d907088348c35eed1698e0428326c0e8788e..9678ab6aa8ee846dabca72bb413820584aaabfe2 100644 (file)
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -825,6 +825,10 @@ accepted are `normal`, `black`, `red`, `green`, `yellow`, `blue`,
 `blink` and `reverse`.  The first color given is the foreground; the
 second is the background.  The position of the attribute, if any,
 doesn't matter.
++
+Colors (foreground and background) may also be given as numbers between
+0 and 255; these use ANSI 256-color mode (but note that not all
+terminals may support this).
 
 color.diff::
        Whether to use ANSI escape sequences to add color to patches.