diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..c284fd6
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,2 @@
+github.com/benbjohnson/clock v1.3.0 h1:ip6w0uFQkncKQ979AypyG0ER7mqUSBdKLOgAle/AT8A=
+github.com/benbjohnson/clock v1.3.0/go.mod h1:J11/hYXuz8f4ySSvYwY0FKfm+ezbsZBKZxNJlLklBHA=