Tip for those using gin and want to override flags

README.md

@@ -29,4 +29,10 @@ gin -h
 `gin` assumes that your web app binds itself to the `PORT` environment 
 variable so it can properly proxy requests to your app. Web frameworks 
 like [Martini](http://github.com/codegangsta/martini) do this out of 
-the box.
+the box.
+
+## Using flags?
+When you normally start your server with [flags](https://godoc.org/flag)
+if you want to override any of them when running `gin` we suggest you 
+instead use [github.com/namsral/flag](https://github.com/namsral/flag)
+as explained in [this post](http://stackoverflow.com/questions/24873883/organizing-environment-variables-golang/28160665#28160665)