From my understanding, having a disability, whatever it may be, isn’t all that’s required for the DTC. The disability has to significantly impact one’s activities of daily living, either by ensuring they cannot do X activities or they take an inordinate amount of time to do X activities. Without knowing very much about your situation, I’m guessing by “more information” the CRA wants details on the ways it prevents you from the daily living actions listed on the DTC form.