Document the workspace.

Mantle · Mar 25, 2014 · a782b0f · a782b0f
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diff --git a/README.md b/README.md
@@ -472,6 +472,8 @@ If you would prefer to use [CocoaPods](http://cocoapods.org), there are some
 [Mantle podspecs](https://github.com/CocoaPods/Specs/tree/master/Mantle) that
 have been generously contributed by third parties.
 
+If you’re instead developing Mantle on its own, use the `Mantle.xcworkspace` file.
+
 ## License
 
 Mantle is released under the MIT license. See