To add help on your FO verbs:
Add a line or two of comment to the top of each verb that users would call directly. Recompile the verb with the comment.
You then need to set the feature verbs of your feature by using an eval:
;#<your-fo>:set_feature_verbs({"verb1", "verb2"})
Note if you have a verb with more than one name, only add one of the names in when you set the feature verbs).