diff --git a/README.md b/README.md
index ab090980a1..4f1c565891 100644
--- a/README.md
+++ b/README.md
@@ -135,6 +135,7 @@ Obtaining API Keys
 - Click on *Settings* on the sidebar, then click **+ Add Platform**
 - Select **Website**
 - Enter `http://localhost:3000` for *Site URL*
+- Note: Once user logs in and Facebook redirects back to website, they will append "#_=_" to your URL. See [Stack Overflow](https://stackoverflow.com/questions/7131909/facebook-callback-appends-to-return-url) for ways to handle it.
 
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