[PATCH] docs: mention the $OSTREE_REPO environment variable

[Marcus Folkesson <marcus folkesson gmail com>]

$OSTREE_REPO may be set to override the default location
of the repository.

Signed-off-by: Marcus Folkesson <marcus folkesson gmail com>
---
I was supposed to implement this function when I saw that it was
already implemented, just undocumented.


 docs/manual/repo.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/docs/manual/repo.md b/docs/manual/repo.md
index abfc4911..901b6835 100644
--- a/docs/manual/repo.md
+++ b/docs/manual/repo.md
@@ -93,8 +93,8 @@ HTTP.  Like tar files, it can be read/written by non-root users.
 
 On an OSTree-deployed system, the "system repository" is
 `/ostree/repo`.  It can be read by any uid, but only written by root.
-Unless the `--repo` argument is given to the <command>ostree</command>
-command, it will operate on the system repository.
+The <command>ostree</command> command will operate on the system repository
+unless $OSTREE_REPO environment variable is set nor the --repo argument is given.
 
 ## Refs
 
-- 
2.13.1