diff --git a/chameleonic.p8 b/chameleonic.p8
index 3993ee0..e9408bc 100644
--- a/chameleonic.p8
+++ b/chameleonic.p8
@@ -1115,6 +1115,8 @@ function rope:_drag1(n1,ax1_new,ay1_new)
     -- (2) ignore cases where the angle is not between the two lines
     -- (3) ignore cases where the created point is further from the original point
     --     than the _intended_ one would be
+    -- Note that if x or y is held constant, this can be implemented
+    -- with a sort on x or y. For our game this is true.
     -- 
     _in_box(anchor.ax,anchor.ay,ax0,ay0,ax1_old,ay1_old) and
     _which_side(anchor.ax,anchor.ay,ax0,ay0,ax1_old,ay1_old) !=