README.markdown in markpercival-rturk-1.0.3 vs README.markdown in markpercival-rturk-1.0.4

@@ -9,10 +9,10 @@
 If you want to build forms that are hosted on Mechanical Turk, this is not the library you need.
 You'd be better off with amazon's official library, in all its XML cruftiness.
 
 ## Installation
 
-    sudo gem install markpercival-rturk --sources http://gems.github.com
+    sudo gem install markpercival-rturk --source http://gems.github.com
     
 ## Use
 
 Let's say you have a form at "http://myapp.com/turkers/add_tags" where Turkers can add some tags to items in your catalogue.
 
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