diff --git a/assignments/guestbook.md b/assignments/guestbook.md
index 9188ecd..cdab24f 100644
--- a/assignments/guestbook.md
+++ b/assignments/guestbook.md
@@ -3,3 +3,4 @@
 Students, add something interesting below and submit a pull request. It might be
 a (school appropriate) picture, quote, or other message. Be creative!
 
+"When they tell you to grow up, they mean stop growing." -Tom Robbins