Update README.markdown

Author: JonRowe

README.markdown

@@ -60,8 +60,8 @@ like this:
 
 After the initial clone you can run `rake git:pull` from the rspec-dev
 directory to update all of the rspec repos (in repos). Note that the update script 
-will look for the repos all under the same user as rspec-dev, so if you have forked this repo, 
-you need to fork them all.
+will look for the repos on github from the same source as rspec-dev, so if you have forked
+this repo and have that set to origin, you will need to fork them all.
 
 Run `rake -T` to see the available tasks for dev mode.