1 files changed, 2 insertions, 0 deletions
diff --git a/tests/lib b/tests/lib
index ee4bfd0..1d189a9 100644
--- a/tests/lib
+++ b/tests/lib
@@ -188,6 +188,8 @@ t-git-merge-base () {
 }
 
 t-has-ancestor () {
+	# t-has-ancestor ANCESTOR
+	# (CHILD is implicit, HEAD)
 	local now=`git rev-parse HEAD`
 	local ancestor=`git rev-parse $1^{}`
 	local mbase=`t-git-merge-base $ancestor $now`