diff --git a/Dockerfile b/Dockerfile
index f66ea0d3..c9562b05 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,3 +1,4 @@
+# base Docker image, remove "-alpine" if having trouble
 FROM node:10.5.0-alpine
 
 # added this step to prevent angular.json not found error
@@ -28,4 +29,4 @@ RUN npm update ws --depth 4
 
 EXPOSE 4200
 
-CMD ["npm", "start"]
\ No newline at end of file
+CMD ["npm", "start"]