diff --git a/lesson_index.js b/lesson_index.js
index bda2cbf79a..b7c67fbe24 100644
--- a/lesson_index.js
+++ b/lesson_index.js
@@ -57,7 +57,8 @@ import l3_complete from './3/14-lessoncomplete.md'
 // chapterList is an ordered array of chapters. The order represents the order of the chapters.
 // chapter index will be 1-based and not zero-based. First chapter is 1
 
-export default {
+// English (source for all translations)
+const en = {
   1: [
     l1_overview,
     lessonoverview,
@@ -114,3 +115,7 @@ export default {
   4:[],
   5:[],
 }
+
+export default {
+  en
+}