completion: add comment for test_completion()

diff --git a/t/t4013/diff.whatchanged_-SF_-p_master b/t/t4013/diff.whatchanged_-SF_-p_master
index 6a76f4e60430ec4ebd3ae3edfd2bac44f911bc23..f39da84822845984e0f431cf84e71fc48853a3c8 100644 (file)
--- a/t/t4013/diff.whatchanged_-SF_-p_master
+++ b/t/t4013/diff.whatchanged_-SF_-p_master
@@ -1,5 +1,5 @@
 $ git whatchanged -SF -p master
-commit 889b315013ef9f2e2f90aa0b054b267c8a557847
+commit 9a6d4949b6b76956d9d5e26f2791ec2ceff5fdc0
 Author: A U Thor <author@example.com>
 Date:   Mon Jun 26 00:02:00 2006 +0000