diff --git a/custom.css b/custom.css
index 0003338..2218bec 100644
--- a/custom.css
+++ b/custom.css
@@ -1,3 +1,6 @@
+/* Change global color variables
+   https://usebilly.app/en/support/custom-css */
+
 /* Change global color variables */
 :root {
 	/* --primary: #121212; /* default text */