doc: generate a list of valid merge tools

diff --git a/Documentation/git-rev-parse.txt b/Documentation/git-rev-parse.txt
index 4cc3e9586fcfd79ddeb7f636141e1a878285b0b5..3c63561f02aca6f934c47a2897f8e50cf4ac5fe5 100644 (file)
--- a/Documentation/git-rev-parse.txt
+++ b/Documentation/git-rev-parse.txt
@@ -101,6 +101,12 @@ OPTIONS
        The option core.warnAmbiguousRefs is used to select the strict
        abbreviation mode.
 
+--disambiguate=<prefix>::
+       Show every object whose name begins with the given prefix.
+       The <prefix> must be at least 4 hexadecimal digits long to
+       avoid listing each and every object in the repository by
+       mistake.
+
 --all::
        Show all refs found in `refs/`.