diff --git a/README.md b/README.md
index 8ddfab3..0e16b26 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ the player character is currently the dark green square. creating new tiles crea
 
 moving onto boxes makes you enter them. right now, this doesn't change your position; in the future entering a box from e.g. the left side will make you move to its left edge.
 
-moving out of bounds makes you exit the box, if you're in one. this also doesn't change your position yet. if you exit at a position where there's another box in the one you exit into, you'll immediately enter that box.
+moving outside of the edge makes you exit the box you're in, if you're currently inside a box. this also doesn't change your position yet. if you exit at a position where there's another box in the one you exit into, you'll immediately enter that box.
 
 there's a demo video at `/assets/demo_video.webm`.