Merge branch 'maint'

* maint:
  git-prompt: Document GIT_PS1_DESCRIBE_STYLE

diff --cc contrib/completion/git-prompt.sh
index 00fc099b8d0f9f048cd9336f079929a336d79de2,5ab488cd65a40abeb211ed5934bd4741972cd556..a8b53ba5f3ed1e34acfdae99bb218223ba9f40f0
--- 1/contrib/completion/git-prompt.sh
--- 2/contrib/completion/git-prompt.sh
+++ b/contrib/completion/git-prompt.sh
@@@ -55,10 -50,15 +55,19 @@@
  # GIT_PS1_SHOWUPSTREAM, you can override it on a per-repository basis by
  # setting the bash.showUpstream config variable.
  #
- #
+ # If you would like to see more information about the identity of
+ # commits checked out as a detached HEAD, set GIT_PS1_DESCRIBE_STYLE
+ # to one of these values:
+ #
+ #     contains      relative to newer annotated tag (v1.6.3.2~35)
+ #     branch        relative to newer tag or branch (master~4)
+ #     describe      relative to older annotated tag (v1.6.3.1-13-gdd42c2f)
+ #     default       exactly matching tag
++#
 +# If you would like a colored hint about the current dirty state, set
 +# GIT_PS1_SHOWCOLORHINTS to a nonempty value. The colors are based on
 +# the colored output of "git status -sb".
+ 
  # __gitdir accepts 0 or 1 arguments (i.e., location)
  # returns location of .git repo
  __gitdir ()