diff --git a/src/render/gpustate.rs b/src/render/gpustate.rs
index ad02067..7bd12ac 100644
--- a/src/render/gpustate.rs
+++ b/src/render/gpustate.rs
@@ -270,10 +270,8 @@ impl GPUState {
 			let height = texture.height * s.scale;
 			let width = height * texture.aspect;
 
-			// Sprite scale is relative to the sprite's defined height,
-			// so we apply both factors here
-
-			// Don't compute matrices for sprites that are off the screen
+			// Don't draw (or compute matrices for)
+			// sprites that are off the screen
 			if pos.x < clip_ne.x - width
 				|| pos.y > clip_ne.y + height
 				|| pos.x > clip_sw.x + width
@@ -283,6 +281,12 @@ impl GPUState {
 				continue;
 			}
 
+			// Compute the values we need to draw
+			// scale: combines texture scale and zoom scale.
+			// screen_pos: position of this sprite in screen coordinates
+			//
+			// We can't use screen_pos to exclude off-screen sprites because
+			// it can't account for height and width.
 			let scale = height / camera.zoom;
 			let screen_pos: Point2<f32> = pos / camera.zoom;