doc: advertise GIT_CONFIG_NOSYSTEM

diff --git a/Documentation/git.txt b/Documentation/git.txt
index 27da0eb209446ea9d7c1b7705f64403f0013e49b..96712889f8951bd18499d036d49d1d0af5dc9e8c 100644 (file)
--- a/Documentation/git.txt
+++ b/Documentation/git.txt
@@ -771,6 +771,14 @@ for further details.
        and read the password from its STDOUT. See also the 'core.askpass'
        option in linkgit:git-config[1].
 
+'GIT_CONFIG_NOSYSTEM'::
+       Whether to skip reading settings from the system-wide
+       `$(prefix)/etc/gitconfig` file.  This environment variable can
+       be used along with `$HOME` and `$XDG_CONFIG_HOME` to create a
+       predictable environment for a picky script, or you can set it
+       temporarily to avoid using a buggy `/etc/gitconfig` file while
+       waiting for someone with sufficient permissions to fix it.
+
 'GIT_FLUSH'::
        If this environment variable is set to "1", then commands such
        as 'git blame' (in incremental mode), 'git rev-list', 'git log',