I can't see graph in org-agenda. At the moment, I only have one entry from
todo to done - is one entry too little information to develop graph and
will it develop later as I put in more entries?

* Habits
*** TODO Do dishes
    SCHEDULED: <2014-08-31 Sun +1d>
    - State "DONE"       from "TODO"       [2014-08-30 Sat 12:09]
    :PROPERTIES:
    :STYLE:    habit
    :LAST_REPEAT: [2014-08-30 Sat 12:09]
    :END: