When wanting to add a url alias to the venue content type I ran into the problem that I was missing a token that I wanted to use. I wanted to add the city field of the location field in the venue content type to the url for Search Engine Optimization reasons. There is a token for the whole location field but it is not what I wanted, I just wanted the city field. The best solution here was to create a custom token for this field, so here are the steps I followed to create one. You first of all have to define your token in the hook_token_info():