diff --git a/Library/Homebrew/cmd/deps.rb b/Library/Homebrew/cmd/deps.rb
index 0a40137e3f..13c2e85904 100644
--- a/Library/Homebrew/cmd/deps.rb
+++ b/Library/Homebrew/cmd/deps.rb
@@ -130,7 +130,7 @@ module Homebrew
     if ARGV.include?("--annotate")
       str = "#{str}  [build]" if dep.build?
       str = "#{str}  [test]" if dep.test?
-      str = "#{str}  [optional" if dep.optional?
+      str = "#{str}  [optional]" if dep.optional?
       str = "#{str}  [recommended]" if dep.recommended?
     end