diff --git a/html/illumination_curve.js b/html/illumination_curve.js
index 7357daf..f51978d 100644
--- a/html/illumination_curve.js
+++ b/html/illumination_curve.js
@@ -56,6 +56,9 @@ class IlluminationPoint {
     }
 }
 
+/**
+ * drawing functions for the bezier path and handles
+ */
 class Drawer {
     constructor(context) {
         this.draw = context;