Let R be a commutative Noetherian complete local ring, I an ideal of R, and M, N Matlis reflexive R-modules such that SuppN ⊆ VI. In this note, among other things, we show that Exti RNHj I M is Matlis reflexive for all i and j when one of the following conditions holds: (a) dimR/I = 1; (b) I is a principal ideal; (c) dimR ≤ 2.
