diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..48b8fc0
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module github.com/jtolds/gls
+
+require github.com/gopherjs/gopherjs v0.0.0-20181103185306-d547d1d9531e
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..19a7b02
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,2 @@
+github.com/gopherjs/gopherjs v0.0.0-20181103185306-d547d1d9531e h1:JKmoR8x90Iww1ks85zJ1lfDGgIiMDuIptTOhJq+zKyg=
+github.com/gopherjs/gopherjs v0.0.0-20181103185306-d547d1d9531e/go.mod h1:wJfORRmW1u3UXTncJ5qlYoELFm8eSnnEO6hX4iZ3EWY=