diff --git a/Library/Homebrew/exceptions.rb b/Library/Homebrew/exceptions.rb
index 47ea8c56e3..6172f4fa9d 100644
--- a/Library/Homebrew/exceptions.rb
+++ b/Library/Homebrew/exceptions.rb
@@ -19,13 +19,13 @@ end
 
 class FormulaUnspecifiedError < UsageError
   def initialize
-    super "This command requires a formula argument"
+    super "this command requires a formula argument"
   end
 end
 
 class KegUnspecifiedError < UsageError
   def initialize
-    super "This command requires a keg argument"
+    super "this command requires a keg argument"
   end
 end