Expand documentation describing --signoff

diff --git a/Documentation/git-am.txt b/Documentation/git-am.txt
index dbea6e7ae9131a1e5c51dec460d58cc6deda701b..13cdd7f3b636dfadc262dcf099653775ec53cd5a 100644 (file)
--- a/Documentation/git-am.txt
+++ b/Documentation/git-am.txt
@@ -35,6 +35,7 @@ OPTIONS
 --signoff::
        Add a `Signed-off-by:` line to the commit message, using
        the committer identity of yourself.
+       See the signoff option in linkgit:git-commit[1] for more information.
 
 -k::
 --keep::
@@ -141,7 +142,9 @@ default.   You can use `--no-utf8` to override this.
 
 -S[<keyid>]::
 --gpg-sign[=<keyid>]::
-       GPG-sign commits.
+       GPG-sign commits. The `keyid` argument is optional and
+       defaults to the committer identity; if specified, it must be
+       stuck to the option without a space.
 
 --continue::
 -r::