diff --git a/util/reserved.json b/util/reserved.json
index a64059d4a7..c0a4c5dee0 100644
--- a/util/reserved.json
+++ b/util/reserved.json
@@ -21,6 +21,10 @@
     "authorization",
     "authorize",
     "aux",
+    "ad",
+    "ads",
+    "advertisment",
+    "advertisments",
     "billing",
     "blog",
     "calendar",