diff --git a/guides/source/api_documentation_guidelines.md b/guides/source/api_documentation_guidelines.md
index 5b34330936..34b9c0d2ca 100644
--- a/guides/source/api_documentation_guidelines.md
+++ b/guides/source/api_documentation_guidelines.md
@@ -20,7 +20,7 @@ The [Rails API documentation](http://api.rubyonrails.org) is generated with
 in the rails root directory, run `bundle install` and execute:
 
 ```bash
-  ./bin/rails rdoc
+  bundle exec rake rdoc
 ```
 
 Resulting HTML files can be found in the ./doc/rdoc directory.