added some comments (specific to locator functionality) and fixed a typo

added some comments (specific to locator functionality) and fixed a typo.  let me know if you have any comments/criticisms regarding the additions.  no offense will be taken!

github said the branches could be automatically merged, so please let me know if there is something more convenient for you than me forking to my own repo and then submitting a pull request.  im still getting the hang of this.