In ab2a1a32 Junio improved the reflog query logic to support
obtaining the n-th prior value of a ref, but this was never
documented in git-rev-parse.  Now it is.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
---
 Documentation/git-rev-parse.txt |   10 +++++++++-
 1 files changed, 9 insertions(+), 1 deletions(-)

diff --git a/Documentation/git-rev-parse.txt b/Documentation/git-rev-parse.txt
index 4eaf5a0..7bfbe1b 100644
--- a/Documentation/git-rev-parse.txt
+++ b/Documentation/git-rev-parse.txt
@@ -148,10 +148,18 @@ blobs contained in a commit.
   enclosed in a brace
   pair (e.g. '\{yesterday\}', '\{1 month 2 weeks 3 days 1 hour 1
   second ago\}' or '\{1979-02-26 18:30:00\}') to specify the value
-  of the ref at a prior point in time.  This suffix may only be
+  of the ref at a prior point in time.This suffix may only be
   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>).
+
 * 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}'
-- 
1.5.0.rc1.g556b

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