Update README.md

README.md

@@ -14,6 +14,10 @@ APIs that talk to each other over HTTP and Redis pub-sub channels. This reposito
 pulls together all of the different services and allows you to set up and run
 them quickly.
 
+*Note: Please make sure you have your public key configured with github since
+we use ssh to pull additional repositories from github when you run the install
+script.*
+
 First, check out a local copy of this repository:
 
 	$ git clone git@github.com:sharelatex/sharelatex.git