help: add --config to list all available config

diff --git a/Documentation/git-help.txt b/Documentation/git-help.txt
index a40fc38d8b425fae0a1ca074ecc8d603efc80f14..83d25d825aa5a9b68f3cff5290d1ebacef35ebde 100644 (file)
--- a/Documentation/git-help.txt
+++ b/Documentation/git-help.txt
@@ -45,6 +45,11 @@ OPTIONS
        When used with `--verbose` print description for all recognized
        commands.
 
+-c::
+--config::
+       List all available configuration variables. This is a short
+       summary of the list in linkgit:git-config[1].
+
 -g::
 --guides::
        Prints a list of useful guides on the standard output. This