Update README.md

nuclearace · nuclearace · commit 9355fc50772c · 2015-09-15T18:27:50.000-04:00
diff --git a/README.md b/README.md
@@ -67,7 +67,7 @@ Add this line to your `Cartfile`:
 github "socketio/socket.io-client-swift" ~> 3.0.1 # Or latest version
 ```
 
-Run `carthage update`.
+Run `carthage update --platform ios,macosx`.
 
 Manually (iOS 7+)
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