diff --git a/Documentation/git-filter-branch.txt b/Documentation/git-filter-branch.txt
index 8c43be611a3a632788e4dcb9e322c4522fccb334..ae03514e4d627dc3c4e6eee7d9f9d625d96da33b 100644
--- a/Documentation/git-filter-branch.txt
+++ b/Documentation/git-filter-branch.txt
@@ -12,7 +12,8 @@ SYNOPSIS
 	[--index-filter <command>] [--parent-filter <command>]
 	[--msg-filter <command>] [--commit-filter <command>]
 	[--tag-name-filter <command>] [--subdirectory-filter <directory>]
-	[-d <directory>] [-f | --force] [<rev-list options>...]
+	[--original <namespace>] [-d <directory>] [-f | --force]
+	[<rev-list options>...]
 
 DESCRIPTION
 -----------
@@ -134,6 +135,10 @@ definition impossible to preserve signatures at any rate.)
 	The result will contain that directory (and only that) as its
 	project root.
 
+--original <namespace>::
+	Use this option to set the namespace where the original commits
+	will be stored. The default value is 'refs/original'.
+
 -d <directory>::
 	Use this option to set the path to the temporary directory used for
 	rewriting.  When applying a tree filter, the command needs to