[PATCH] Document -u option in git-svnimport man page

diff --git a/Documentation/git-svnimport.txt b/Documentation/git-svnimport.txt
index 2cfc407..c9c8c5d 100644
--- a/Documentation/git-svnimport.txt
+++ b/Documentation/git-svnimport.txt

@@ -65,6 +65,9 @@ When importing incrementally, you might need to edit the .git/svn2git file.
 	Prepend 'rX: ' to commit messages, where X is the imported
 	subversion revision.
 
+-u::
+	Replace underscores in tag names with periods.
+
 -I <ignorefile_name>::
 	Import the svn:ignore directory property to files with this
 	name in each directory. (The Subversion and GIT ignore

-- 
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