do not segfault if make_cache_entry failed

diff --git a/Documentation/git-for-each-ref.txt b/Documentation/git-for-each-ref.txt
index ebd7c5fbb34576fd2af98b00d9045340ff77ee2b..5061d3e4e7b8a888093c5e8c7b4cb03509391756 100644 (file)
--- a/Documentation/git-for-each-ref.txt
+++ b/Documentation/git-for-each-ref.txt
@@ -74,6 +74,7 @@ For all objects, the following names can be used:
 
 refname::
        The name of the ref (the part after $GIT_DIR/).
+       For a non-ambiguous short name of the ref append `:short`.
 
 objecttype::
        The type of the object (`blob`, `tree`, `commit`, `tag`).