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diff --git a/doc/config.but b/doc/config.but
index 5498c6c0..d24aaf17 100644
--- a/doc/config.but
+++ b/doc/config.but
@@ -1,4 +1,4 @@
-\versionid $Id: config.but,v 1.96 2004/10/24 18:26:00 jacob Exp $
+\define{versionidconfig} \versionid $Id$
 
 \C{config} Configuring PuTTY
 
@@ -1389,6 +1389,40 @@ immediately.
 
 The Colours panel allows you to control PuTTY's use of colour.
 
+\S{config-ansicolour} \q{Allow terminal to specify ANSI colours}
+
+\cfg{winhelp-topic}{colours.ansi}
+
+This option is enabled by default. If it is disabled, PuTTY will
+ignore any control sequences sent by the server to request coloured
+text.
+
+If you have a particularly garish application, you might want to
+turn this option off and make PuTTY only use the default foreground
+and background colours.
+
+\S{config-xtermcolour} \q{Allow terminal to use xterm 256-colour mode}
+
+\cfg{winhelp-topic}{colours.xterm256}
+
+This option is enabled by default. If it is disabled, PuTTY will
+ignore any control sequences sent by the server which use the
+extended 256-colour mode supported by recent versions of \cw{xterm}.
+
+If you have an application which is supposed to use 256-colour mode
+and it isn't working, you may find you need to tell your server that
+your terminal supports 256 colours. On Unix, you do this by ensuring
+that the setting of \cw{TERM} describes a 256-colour-capable
+terminal. You can check this using a command such as \c{infocmp}:
+
+\c $ infocmp | grep colors
+\c         colors#256, cols#80, it#8, lines#24, pairs#256,
+\e         bbbbbbbbbb
+
+If you do not see \cq{colors#256} in the output, you may need to
+change your terminal setting. On modern Linux machines, you could
+try \cq{xterm-256color}.
+
 \S{config-boldcolour} \q{Bolded text is a different colour}
 
 \cfg{winhelp-topic}{colours.bold}
@@ -1540,9 +1574,9 @@ To remove one from the list, select it in the list box and press
 
 \cfg{winhelp-topic}{connection.keepalive}
 
-If you find your sessions are closing unexpectedly (\q{Connection
-reset by peer}) after they have been idle for a while, you might
-want to try using this option.
+If you find your sessions are closing unexpectedly (most often with
+\q{Connection reset by peer}) after they have been idle for a while,
+you might want to try using this option.
 
 Some network routers and firewalls need to keep track of all
 connections through them. Usually, these firewalls will assume a