diff --git a/Docker/hello-docker/index.json b/Docker/hello-docker/index.json
index a0180e88b71ae98a09a86e91a1f4c4f11a43f568..e464cccefcb98d49ec22f17f45b9399563f5c485 100644
--- a/Docker/hello-docker/index.json
+++ b/Docker/hello-docker/index.json
@@ -11,7 +11,7 @@
       }
     ],
     "intro": {
-      "text": "intro.md"
+      "text": "intro.md",
       "courseData": "intro-course-data.sh",
       "credits": "This course was inpired by [Docker and Makefiles example from Ben Hall](https://github.com/BenHall/katacoda-scenarios/tree/master/1)"
     },