diff --git a/bevy_kayak_ui/src/render/unified/shader.wgsl b/bevy_kayak_ui/src/render/unified/shader.wgsl
index f1aad19403bd159bf3d8e060c8b78423eb7ff688..b43867e2662cb4a946bb4e94ddddbde284304843 100644
--- a/bevy_kayak_ui/src/render/unified/shader.wgsl
+++ b/bevy_kayak_ui/src/render/unified/shader.wgsl
@@ -51,6 +51,7 @@ var image_sampler: sampler;
 
 let RADIUS: f32 = 0.1;
 
+// Where P is the position in pixel space, B is the size of the box adn R is the radius of the current corner.
 fn sdRoundBox(p: vec2<f32>, b: vec2<f32>, r: f32) -> f32 
 {
     var q = abs(p)-b+r;