git-p4: Clean up git-p4 submit's log message handling.

diff --git a/Documentation/git-tag.txt b/Documentation/git-tag.txt
index 22a23bf96f9d851546c296ad559f6ae4a23eedb1..b62a3d1c5896a3b2e32af58029115240d609f37b 100644 (file)
--- a/Documentation/git-tag.txt
+++ b/Documentation/git-tag.txt
@@ -65,7 +65,9 @@ OPTIONS
        Typing "git tag" without arguments, also lists all tags.
 
 -m <msg>::
-       Use the given tag message (instead of prompting)
+       Use the given tag message (instead of prompting).
+       If multiple `-m` options are given, there values are
+       concatenated as separate paragraphs.
 
 -F <file>::
        Take the tag message from the given file.  Use '-' to
@@ -214,6 +216,27 @@ having tracking branches.  Again, the heuristic to automatically
 follow such tags is a good thing.
 
 
+On Backdating Tags
+~~~~~~~~~~~~~~~~~~
+
+If you have imported some changes from another VCS and would like
+to add tags for major releases of your work, it is useful to be able
+to specify the date to embed inside of the tag object.  The data in
+the tag object affects, for example, the ordering of tags in the
+gitweb interface.
+
+To set the date used in future tag objects, set the environment
+variable GIT_AUTHOR_DATE to one or more of the date and time.  The
+date and time can be specified in a number of ways; the most common
+is "YYYY-MM-DD HH:MM".
+
+An example follows.
+
+------------
+$ GIT_AUTHOR_DATE="2006-10-02 10:31" git tag -s v1.0.1
+------------
+
+
 Author
 ------
 Written by Linus Torvalds <torvalds@osdl.org>,
@@ -225,4 +248,4 @@ Documentation by David Greaves, Junio C Hamano and the git-list <git@vger.kernel
 
 GIT
 ---
-Part of the gitlink:git[7] suite
+Part of the linkgit:git[7] suite