diff --git a/lesson-plans/side-effects/README.md b/lesson-plans/side-effects/README.md
index 663c5f7..1a49e81 100644
--- a/lesson-plans/side-effects/README.md
+++ b/lesson-plans/side-effects/README.md
@@ -4,7 +4,7 @@ Learn about reference vs. value, and how to avoid side-effects in JS functions.
 
 ---
 
-## Before Class
+## Prep Work
 
 Study arrays and come prepared to use these language features in class: