diff --git a/README.md b/README.md
index f3c54d7..89bdecb 100644
--- a/README.md
+++ b/README.md
@@ -113,6 +113,8 @@ There's also helper for this. To use it, you need:
 Say, you have a model `User` (which must have attribute or method `name`)
 
 ```ruby
+require 'letter_avatar/has_avatar'
+
 class User
   include LetterAvatar::HasAvatar
   ...
--
libgit2 0.21.0