diff --git a/_data/simple-icons.json b/_data/simple-icons.json
index a127adeb5..b4a6c8762 100644
--- a/_data/simple-icons.json
+++ b/_data/simple-icons.json
@@ -9366,7 +9366,8 @@
         {
             "title": "Mastodon",
             "hex": "6364FF",
-            "source": "https://github.com/mastodon/mastodon/blob/7ccf7a73f1c47a8c03712c39f7c591e837cf6d08/app/javascript/images/logo-symbol-icon.svg"
+            "source": "https://github.com/mastodon/mastodon/blob/7ccf7a73f1c47a8c03712c39f7c591e837cf6d08/app/javascript/images/logo-symbol-icon.svg",
+            "guidelines": "https://joinmastodon.org/branding"
         },
         {
             "title": "Material Design",