Clarify file name

jasonrudolph · jasonrudolph · commit 203625a1bc73 · 2013-03-10T20:35:35.000-04:00
diff --git a/content/guides/basics-of-authentication.md b/content/guides/basics-of-authentication.md
@@ -184,7 +184,7 @@ and paste these lines into it:
 
 Much of the code should look familiar. For example, we're still using `RestClient.get` 
 to call out to the GitHub API, and we're still passing our results to be renderend
-in an ERB template (this time, it's called `advanced`). Some of the other details--
+in an ERB template (this time, it's called `advanced.erb`). Some of the other details--
 like turning our app into a class that inherits from `Sinatra::Base`, are a result
 of inheriting from `sinatra/auth/github`, which written as [a Sinatra extension][sinatra extension].
 
