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diff --git a/week9.mdwn b/week9.mdwn
index b2fbb3aa..7028e892 100644
--- a/week9.mdwn
+++ b/week9.mdwn
@@ -332,7 +332,7 @@ Let's consider how to interpet our new syntactic forms `newref`, `deref`, and `s
 				in (Index new_index, s'')
 			... 
 
-2.	When `expr` evaluates to a `store_index`, then `deref expr` should evaluate to whatever value is at that index in the current store. (If `expr` evaluates to a value of another type, `deref expr` is undefined.) In this operation, we don't change the store at all; we're just reading from it. So we'll return the same store back unchanged.
+2.	When `expr` evaluates to a `store_index`, then `deref expr` should evaluate to whatever value is at that index in the current store. (If `expr` evaluates to a value of another type, `deref expr` is undefined.) In this operation, we don't change the store at all; we're just reading from it. So we'll return the same store back unchanged (assuming it wasn't changed during the evaluation of `expr`).
 
 		let rec eval expression g s =
 			match expression with