Example Statement 1:
If you have a documented learning disability or other condition that may affect academic performance you should: 1) make sure this documentation is on file with the Office of Disability Services (SUB I, Rm. 222; 993-2474; http://www.gmu.edu/student/drc/) to determine the accommodations you need; and 2) talk with me to discuss your accommodation needs.

Example Statement 2:
If you have a learning or physical difference that may affect your academic work, you will need to furnish appropriate documentation to the Disability Resource Center.  If you qualify for accommodation, the DRC staff will give you a form detailing appropriate accommodations for your instructor. 

In addition to providing your professors with the appropriate form, please take the initiative to discuss accommodation with them at the beginning of the semester and as needed during the term.  Because of the range of learning differences, faculty members need to learn from you the most effective ways to assist you. 
If you have contacted the Disability Resource Center and are waiting to hear from a counselor, please tell me.