[PATCH] doc: mention 'git show' defaults to HEAD

[Todd Zullinger <tmz@pobox.com>]

When 'git show' is called without any object it defaults to HEAD.  This
has been true since d4ed9793fd ("Simplify common default options setup
for built-in log family.", 2006-04-16).

The SYNOPSIS suggests that the object argument is required.  Clarify
that it is not required and note the default.

Signed-off-by: Todd Zullinger <tmz@pobox.com>
---
This was mentioned in #git today by qaz.  It seems reasonable to document the
default.

 Documentation/git-show.txt | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Documentation/git-show.txt b/Documentation/git-show.txt
index 82a4125a2d..e73ef54017 100644
--- a/Documentation/git-show.txt
+++ b/Documentation/git-show.txt
@@ -9,7 +9,7 @@ git-show - Show various types of objects
 SYNOPSIS
 --------
 [verse]
-'git show' [options] <object>...
+'git show' [options] [<object>...]
 
 DESCRIPTION
 -----------
@@ -35,7 +35,7 @@ This manual page describes only the most frequently used options.
 OPTIONS
 -------
 <object>...::
-	The names of objects to show.
+	The names of objects to show (defaults to 'HEAD').
 	For a more complete list of ways to spell object names, see
 	"SPECIFYING REVISIONS" section in linkgit:gitrevisions[7].
 
-- 
2.16.1