diff --git a/src/utils/misc.ts b/src/utils/misc.ts
index 780709a..d186ec6 100644
--- a/src/utils/misc.ts
+++ b/src/utils/misc.ts
@@ -108,6 +108,7 @@ export const cleanCodeBlock = (text: string) => {
   });
 
   // Keep links
+  // Reference: https://stackoverflow.com/a/3809435/15436737
   text = text.replace(
     /https?:\/\/(www\.)?[-a-zA-Z0-9@:%._+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b[-a-zA-Z0-9()@:%_+.~#?&//=]*/g,
     function (url: string) {