git-merge-tree: generalize the "traverse <n> trees in sync" functionality

diff --git a/Documentation/git-rev-parse.txt b/Documentation/git-rev-parse.txt
index 431b8f6e06194e302aac02fdf90522e6f5c04167..d638bfc202ef9ad0386d640cbf70b9cdb2fff665 100644 (file)
--- a/Documentation/git-rev-parse.txt
+++ b/Documentation/git-rev-parse.txt
@@ -68,10 +68,15 @@ OPTIONS
        Show all refs found in `$GIT_DIR/refs`.
 
 --show-prefix::
-       When the command is invoked from a directory show the
+       When the command is invoked from a subdirectory, show the
        path of the current directory relative to the top-level
        directory.
 
+--show-cdup::
+       When the command is invoked from a subdirectory, show the
+       path of the top-level directory relative to the current
+       directory (typically a sequence of "../", or an empty string).
+
 --since=datestring, --after=datestring::
        Parses the date string, and outputs corresponding
        --max-age= parameter for git-rev-list command.