diff --git a/init.lua b/init.lua
index a5f09ff..22a2a78 100644
--- a/init.lua
+++ b/init.lua
@@ -2,6 +2,7 @@
 -- Skeletal animation: skeleton + bones + tracks + rest + keyframe
 -- + procedural + look-at constraint. Multi-channel animation (rot/pos/scl)
 -- + cascaded world-transform with scale propagation.
+-- Render path: world.scl_x/y (cascaded) + world.rot used for draw_sprite_transform.
 
 local M = {}