diff --git a/Library/Homebrew/formula_support.rb b/Library/Homebrew/formula_support.rb
index aa31742190..12ca38e66d 100644
--- a/Library/Homebrew/formula_support.rb
+++ b/Library/Homebrew/formula_support.rb
@@ -28,6 +28,12 @@ class KegOnlyReason
       Mac OS X already provides this software and installing another version in
       parallel can cause all kinds of trouble.
 
+      #{@explanation}
+      EOS
+    when :shadowed_by_osx then <<-EOS.undent
+      Mac OS X provides similar software, and installing this software in
+      parallel can cause all kinds of trouble.
+
       #{@explanation}
       EOS
     when :provided_pre_mountain_lion then <<-EOS.undent