diff --git a/README.md b/README.md
index 5b9d491..37ae282 100644
--- a/README.md
+++ b/README.md
@@ -3,4 +3,6 @@ Based on Fragsurf by cr4yz (Jake E.), available here: https://github.com/Awesome
 
 A full adaptation of Source engine's movement mechanics in Unity, including strafe jumping, surfing, bunnyhopping, swimming, crouching and jump-crouching (optional), as well as sliding (optional). The player can also push around (and be pushed around by) rigidbodies.
 
+If you want the player to collide with objects that are not on the default layer, you can set the layer mask in the SurfPhysics class.
+
 You can use the included 'Example player prefab' as a base, or just add SurfCharacter to an empty object and do the looking/aiming system yourself.