week1: add side-effects

Signed-off-by: Jim Pryor <profjim@jimpryor.net>

diff --git a/week1.mdwn b/week1.mdwn
index 7ea30c3..9211655 100644 (file)
--- a/week1.mdwn
+++ b/week1.mdwn
@@ -328,7 +328,7 @@ To read further about the relation between declarative or functional programming
 *      [[!wikipedia Purely functional]]
 *      [[!wikipedia Referential transparency (computer science)]]
 *      [[!wikipedia Imperative programming]]
-
+*      [[!wikipedia Side effect (computer science) desc="Side effects"]]
 
 
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