diff --git a/README.md b/README.md
index e8dd291..066ada5 100644
--- a/README.md
+++ b/README.md
@@ -6,9 +6,15 @@ This framework is very much a work in progress at the moment, and should be cons
 
 ## Getting Started
 
-To start building the framework, clone this repository and then run `script/bootstrap`.
+To start building the framework, clone this repository, install `xctool` and then run `script/bootstrap`. 
 This will automatically pull down any dependencies.
 
+To install `xctool` using homebrew:
+
+    brew update
+    brew install xctool
+
+
 ## License
 
 Rebel is released under the MIT license. See [LICENSE.md](https://github.com/github/Rebel/blob/master/LICENSE.md).