+2011-07-10 Lars Magne Ingebrigtsen <larsi@gnus.org>
+
+ * cmdargs.texi (Environment): Mention removing variables
+ (bug#1615). Text suggested by Kevin Rodgers.
+
2011-07-10 Chong Yidong <cyd@stupidchicken.com>
* misc.texi (Amusements): Don't mention Yow; it's crippled.
@vindex initial-environment
Inside Emacs, the command @kbd{M-x getenv} gets the value of an
environment variable. @kbd{M-x setenv} sets a variable in the Emacs
-environment. (Environment variable substitutions with @samp{$} work
-in the value just as in file names; see @ref{File Names with $}.) The
-variable @code{initial-environment} stores the initial environment
-inherited by Emacs.
+environment, and @kbd{C-u M-x setenv} removes a variable.
+(Environment variable substitutions with @samp{$} work in the value
+just as in file names; see @ref{File Names with $}.) The variable
+@code{initial-environment} stores the initial environment inherited by
+Emacs.
The way to set environment variables outside of Emacs depends on the
operating system, and especially the shell that you are using. For