Source : Webster's Revised Unabridged Dictionary (1913)

Commentate \Com"men*tate\, v. t. & i. [L. commentatus, p. p. of
   commentari to meditate.]
   To write comments or notes upon; to make comments. [R.]

         Commentate upon it, and return it enriched. --Lamb.

Source : WordNet®

commentate
     v 1: make a commentary on
     2: serve as a commentator, as in sportscasting