add explanatory note

diff --git a/exercises/assignment2.mdwn b/exercises/assignment2.mdwn
index 098c536..f8467f7 100644 (file)
--- a/exercises/assignment2.mdwn
+++ b/exercises/assignment2.mdwn
@@ -34,6 +34,8 @@ Find "normal forms" for the following---that is, reduce them until no more reduc
 Booleans
 --------
 
+For these questions, and the ones on triples below, we're setting them up so as to encourage you to experiment with Racket and to formulate your answer in Scheme/Racket syntax. But you can answer in Lambda Calculus syntax if you prefer.
+
 Recall our definitions of true and false.
 
 >   **true** is defined to be `\t f. t`