diff --git a/lib/packnga/yard-task.rb b/lib/packnga/yard-task.rb
index 595adbd..c7adb95 100644
--- a/lib/packnga/yard-task.rb
+++ b/lib/packnga/yard-task.rb
@@ -56,11 +56,6 @@ def initialize(spec)
       @source_files = nil
     end
 
-    # @private
-    def text_files
-      @text_files ||= []
-    end
-
     # @private
     def define
       set_default_values