add special "matching refs" refspec

diff --git a/Documentation/git-describe.txt b/Documentation/git-describe.txt
index 270b80875516772618b35fccd1bbac31a5bb46d3..d9aa2f29809eb07385468edd2587daf55339389a 100644 (file)
--- a/Documentation/git-describe.txt
+++ b/Documentation/git-describe.txt
@@ -45,6 +45,11 @@ OPTIONS
        candidates to describe the input committish consider
        up to <n> candidates.  Increasing <n> above 10 will take
        slightly longer but may produce a more accurate result.
+       An <n> of 0 will cause only exact matches to be output.
+
+--exact-match::
+       Only output exact matches (a tag directly references the
+       supplied commit).  This is a synonym for --candidates=0.
 
 --debug::
        Verbosely display information about the searching strategy