describe: Document --match pattern format

It's not clear in git-describe(1) what kind of "pattern" should be
passed to --match.  Fix that.

Signed-off-by: Greg Price <price@mit.edu>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/git-describe.txt b/Documentation/git-describe.txt
index 72d6bb612ba8890a7f2a8c3ff13820a53918c74a..711040d2f1b8537623f633c3d0207ef4e27e1877 100644 (file)
--- a/Documentation/git-describe.txt
+++ b/Documentation/git-describe.txt
@@ -81,8 +81,9 @@ OPTIONS
        that points at object deadbee....).
 
 --match <pattern>::
-       Only consider tags matching the given pattern (can be used to avoid
-       leaking private tags made from the repository).
+       Only consider tags matching the given `glob(7)` pattern,
+       excluding the "refs/tags/" prefix.  This can be used to avoid
+       leaking private tags from the repository.
 
 --always::
        Show uniquely abbreviated commit object as fallback.