diff --git a/assign3.md b/assign3.md
index fd531128bee45f5640a6bd8fa1bf627ff95b6054..cd62b5e9f1db9b48a9ab9f81e60c2acd8f123b93 100644
--- a/assign3.md
+++ b/assign3.md
@@ -207,7 +207,7 @@ to:
 - update the score
 - ensure that the board's layout / draw methods are called by calling `board.setNeedsDisplay()`
 
-**Do not add any externally accessed methods or properties in your custom view.**
+**Do not add any externally-accessed methods or properties in your custom view.**
 
 ## Task 4: Animation
 Implement tile animation entirely in your `BoardView` class: