diff --git a/lib/lydia/helpers.rb b/lib/lydia/helpers.rb
index 0752a9a..4f17efc 100644
--- a/lib/lydia/helpers.rb
+++ b/lib/lydia/helpers.rb
@@ -13,7 +13,7 @@ def params
     end
     
     def send_file(path, mime_type = nil)
-      #todo
+      raise NotImplementedError.new
     end
   end
 end
\ No newline at end of file