diff --git a/README.md b/README.md
index 754f3da..92800ed 100644
--- a/README.md
+++ b/README.md
@@ -66,9 +66,14 @@ This will cause factory\_bot\_rails to automatically load factories in
 It is possible to use this setting to share factories from a gem:
 
 ```rb
+begin
+  require 'factory_bot_rails'
+rescue LoadError
+end
+
 class MyEngine < ::Rails::Engine
   config.factory_bot.definition_file_paths =
-    File.expand_path('../factories', __FILE__) if defined?(FactoryBotRails)
+    [File.expand_path('../factories', __FILE__)] if defined?(FactoryBotRails)
 end
 ```