> Might want to add `:branch => 'stable'` to this if it works for documentation if nothing else.

Is this ok?

```diff
diff --git a/Library/Formula/x264.rb b/Library/Formula/x264.rb
index 8e35ad5..52a1378 100644
--- a/Library/Formula/x264.rb
+++ b/Library/Formula/x264.rb
@@ -2,7 +2,7 @@ require 'formula'

 class X264 < Formula
   homepage "http://www.videolan.org/developers/x264.html"
-  url "http://git.videolan.org/git/x264.git", :revision => "aff928d2a2f601072cebecfd1ac5ff768880cf88"
+  url "http://git.videolan.org/git/x264.git", {:branch => 'stable', :revision => "aff928d2a2f601072cebecfd1ac5ff768880c
   version "r2397"
   head "http://git.videolan.org/git/x264.git"
```

>  I assume this is the latest commit on the `stable` branch?

Yes.