How to set up custom cucumber step definitions path in phpstorm?

Recently I have been developing quite a few tests with cucumber. However when ever I create a test file, I keep getting a notice "undefined step reference x". This must be because most of my step definitionas are in custom locations. Also this means the auto completion doesn't work, which is a pain. However am not able to find any place, where I can specify the location for step definition files. Am I missing something obvious here?