diff --git a/vendor/github.com/mattn/go-runewidth/runewidth_js.go b/vendor/github.com/mattn/go-runewidth/runewidth_js.go
new file mode 100644
index 0000000..c5fdf40
--- /dev/null
+++ b/vendor/github.com/mattn/go-runewidth/runewidth_js.go
@@ -0,0 +1,9 @@
+// +build js
+// +build !appengine
+
+package runewidth
+
+func IsEastAsian() bool {
+	// TODO: Implement this for the web. Detect east asian in a compatible way, and return true.
+	return false
+}