[PATCH 1/3] gc.txt: more details about what gc does

["Nguyễn Thái Ngọc Duy" <pclouds@gmail.com>]

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
---
 Documentation/git-gc.txt | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/Documentation/git-gc.txt b/Documentation/git-gc.txt
index 571b5a7e3c..862c931104 100644
--- a/Documentation/git-gc.txt
+++ b/Documentation/git-gc.txt
@@ -15,8 +15,9 @@ DESCRIPTION
 -----------
 Runs a number of housekeeping tasks within the current repository,
 such as compressing file revisions (to reduce disk space and increase
-performance) and removing unreachable objects which may have been
-created from prior invocations of 'git add'.
+performance), removing unreachable objects which may have been
+created from prior invocations of 'git add', packing refs, pruning
+reflog, rerere or stale working trees.
 
 Users are encouraged to run this task on a regular basis within
 each repository to maintain good disk space utilization and good
@@ -59,6 +60,10 @@ then existing packs (except those marked with a `.keep` file)
 are consolidated into a single pack by using the `-A` option of
 'git repack'. Setting `gc.autoPackLimit` to 0 disables
 automatic consolidation of packs.
++
+If `git gc --auto` goes ahead because of either too loose objects or
+packs, all other housekeeping tasks (e.g. rerere, working trees,
+reflog...) will also be be performed.
 
 --prune=<date>::
 	Prune loose objects older than date (default is 2 weeks ago,
@@ -133,6 +138,9 @@ The optional configuration variable `gc.pruneExpire` controls how old
 the unreferenced loose objects have to be before they are pruned.  The
 default is "2 weeks ago".
 
+The optional gc.worktreePruneExpire controls how old a stale working
+tree before `git worktree prune` deletes it. The default is "3 months
+ago".
 
 Notes
 -----
-- 
2.16.1.435.g8f24da2e1a