read-cache: add post-index-change hook

diff --git a/Documentation/pretty-formats.txt b/Documentation/pretty-formats.txt
index ee08d0906b1090f67329c6349d1defa29dee9bad..7bfffae7652815596dcc29962e67e22efcf3075b 100644 (file)
--- a/Documentation/pretty-formats.txt
+++ b/Documentation/pretty-formats.txt
@@ -134,6 +134,8 @@ The placeholders are:
 - '%cI': committer date, strict ISO 8601 format
 - '%d': ref names, like the --decorate option of linkgit:git-log[1]
 - '%D': ref names without the " (", ")" wrapping.
+- '%S': ref name given on the command line by which the commit was reached
+  (like `git log --source`), only works with `git log`
 - '%e': encoding
 - '%s': subject
 - '%f': sanitized subject line, suitable for a filename