The online ADR system allows you to include allergy info. There are check off boxes for various allergies. It's really nice. Just make sure you do it for each ADR. Previous years, when we had to call for ADRs, it seemed to take forever, because I had to keep repeating the info for every single ADR and wait for the CM to type it in and repeat it back to me. It wasn't unusual to be on the phone for an hour just for a weeks worth of ADRs. The online process took me about 15 min. and that included printing out the confirmations.
Also, email Special Diets for the form. The form allows you to give more specific info than the ADR system.