diff --git a/Documentation/diff-options.txt b/Documentation/diff-options.txt
index 9f7cba2be..ba7cd1348 100644
--- a/Documentation/diff-options.txt
+++ b/Documentation/diff-options.txt
@@ -52,6 +52,9 @@ endif::git-format-patch[]
 --patience::
 	Generate a diff using the "patience diff" algorithm.
 
+--histogram::
+	Generate a diff using the "histogram diff" algorithm.
+
 --stat[=<width>[,<name-width>[,<count>]]]::
 	Generate a diffstat.  You can override the default
 	output width for 80-column terminal by `--stat=<width>`.
diff --git a/t/t5704-bundle.sh b/t/t5704-bundle.sh
index a51c8b056..9e43731fe 100755
--- a/t/t5704-bundle.sh
+++ b/t/t5704-bundle.sh
@@ -54,8 +54,8 @@ test_expect_success 'ridiculously long subject in boundary' '
 	git bundle list-heads long-subject-bundle.bdl >heads &&
 	test -s heads &&
 	git fetch long-subject-bundle.bdl &&
-	sed -n "/^-/{p;q}" long-subject-bundle.bdl >boundary &&
-	grep "^-$_x40 " boundary
+	sed -n "/^-/{p;q;}" long-subject-bundle.bdl >boundary &&
+	grep "^-[0-9a-f]\\{40\\} " boundary
 '
 
 test_done