git-status: do not be totally useless in a read-only repository.

diff --git a/Documentation/git-rev-parse.txt b/Documentation/git-rev-parse.txt
index 4eaf5a0d1ea26798298c4f572c29d90af9dc7cf1..4041a1607081ee6e8d93065c67fc72a513c20b17 100644 (file)
--- a/Documentation/git-rev-parse.txt
+++ b/Documentation/git-rev-parse.txt
@@ -152,6 +152,18 @@ blobs contained in a commit.
   used immediately following a ref name and the ref must have an
   existing log ($GIT_DIR/logs/<ref>).
 
+* A ref followed by the suffix '@' with an ordinal specification
+  enclosed in a brace pair (e.g. '\{1\}', '\{15\}') to specify
+  the n-th prior value of that ref.  For example 'master@\{1\}'
+  is the immediate prior value of 'master' while 'master@\{5\}'
+  is the 5th prior value of 'master'. This suffix may only be used
+  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}'