diff --git a/Jumpy.Shared/Player.cs b/Jumpy.Shared/Player.cs
index c03b8fc..241ea99 100644
--- a/Jumpy.Shared/Player.cs
+++ b/Jumpy.Shared/Player.cs
@@ -38,6 +38,8 @@ namespace Jumpy {
       Rectangle oldBbox = new Rectangle(oldPosition.X - spriteWidth, oldPosition.Y - 7, spriteWidth * 2, 26);
       Rectangle playerBbox = new Rectangle(position.X - spriteWidth, position.Y - 7, spriteWidth * 2, 26);
       bool standingOnGround = false;
+      // TODO: implement https://en.wikipedia.org/wiki/Bresenham%27s_line_algorithm
+      // e.g. http://members.chello.at/~easyfilter/bresenham.html
       foreach (var rect in collisionTargets) {
         playerBbox = new Rectangle(position.X - spriteWidth, position.Y - 7, spriteWidth * 2, 26);