parse-options: add new function "usage_msg_opt"

diff --git a/Documentation/git-gc.txt b/Documentation/git-gc.txt
index 7086eea74a38b036130f61db362bae209a065e47..b292e9843aa9da86cd44bd07d3ce35053be32177 100644 (file)
--- a/Documentation/git-gc.txt
+++ b/Documentation/git-gc.txt
@@ -8,7 +8,7 @@ git-gc - Cleanup unnecessary files and optimize the local repository
 
 SYNOPSIS
 --------
-'git gc' [--aggressive] [--auto] [--quiet]
+'git gc' [--aggressive] [--auto] [--quiet] [--prune=<date> | --no-prune]
 
 DESCRIPTION
 -----------
@@ -59,6 +59,14 @@ are consolidated into a single pack by using the `-A` option of
 'git-repack'. Setting `gc.autopacklimit` to 0 disables
 automatic consolidation of packs.
 
+--prune=<date>::
+       Prune loose objects older than date (default is 2 weeks ago,
+       overrideable by the config variable `gc.pruneExpire`).  This
+       option is on by default.
+
+--no-prune::
+       Do not prune any loose objects.
+
 --quiet::
        Suppress all progress reports.