diff --git a/editor/canvg/canvg.js b/editor/canvg/canvg.js
index 50545c98..f0d6d98c 100644
--- a/editor/canvg/canvg.js
+++ b/editor/canvg/canvg.js
@@ -1437,7 +1437,8 @@
 							var cp = pp.getAsCurrentPoint();
 
 							// Conversion from endpoint to center parameterization
-							// http://www.w3.org/TR/SVG11/implnote.html#ArcImplementationNotes
+							// https://www.w3.org/TR/SVG11/implnote.html#ArcConversionEndpointToCenter
+							
 							// x1', y1'
 							var currp = new svg.Point(
 								Math.cos(xAxisRotation) * (curr.x - cp.x) / 2.0 + Math.sin(xAxisRotation) * (curr.y - cp.y) / 2.0,
@@ -2918,4 +2919,4 @@ if (typeof(CanvasRenderingContext2D) != 'undefined') {
 			scaleHeight: dh
 		});
 	}
-}
\ No newline at end of file
+}