update-index: do not die too early in a read-only repository.

diff --git a/Documentation/git-rev-parse.txt b/Documentation/git-rev-parse.txt
index aeb37b65d26dbc2873438bd7b2c36bf89d24b056..4041a1607081ee6e8d93065c67fc72a513c20b17 100644 (file)
--- a/Documentation/git-rev-parse.txt
+++ b/Documentation/git-rev-parse.txt
@@ -160,6 +160,10 @@ blobs contained in a commit.
   immediately following a ref name and the ref must have an existing
   log ($GIT_DIR/logs/<ref>).
 
+* You can use the '@' construct with an empty ref part to get at a
+  reflog of the current branch. For example, if you are on the
+  branch 'blabla', then '@\{1\}' means the same as 'blabla@\{1\}'.
+
 * A suffix '{caret}' to a revision parameter means the first parent of
   that commit object.  '{caret}<n>' means the <n>th parent (i.e.
   'rev{caret}'