diff --git a/README.md b/README.md
index cea75a04..bcca123d 100644
--- a/README.md
+++ b/README.md
@@ -521,6 +521,7 @@ And use it in your views:
 ```ruby
 f.input :money, as: :currency
 ```
+Note, you may have to create the `app/inputs/` directory and restart your webserver.
 
 You can also redefine existing **Simple Form** inputs by creating a new class with the same name. For
 instance, if you want to wrap date/time/datetime in a div, you can do: