diff --git a/app/models/blog/extend.js b/app/models/blog/extend.js
index 55c1255ceea..8f31505a094 100644
--- a/app/models/blog/extend.js
+++ b/app/models/blog/extend.js
@@ -49,6 +49,8 @@ module.exports = function extend(blog) {
     blog.pretty.domain = punycode.toUnicode(blog.domain);
   }
 
+  // Based on the code in app/local.js this overwrites
+  // the blog's URL when the simple local server is run
   if (config.host === 'localhost') {
     blog.url = 'http://localhost:8081';
     blog.pretty.url = 'localhost:8081';