/enums/shared_set_type.proto 

--- v19/enums/shared_set_type.proto 2025-08-05 14:37:37.000000000 +0000
+++ v20/enums/shared_set_type.proto 2025-08-05 14:37:42.000000000 +0000
@@ -48,5 +48,9 @@

     // A set of brands can be included or excluded from targeting.
     BRANDS = 5;
+
+    // A set of webpages that can be excluded from targeting.
+    // This shared set type is not publicly available.
+    WEBPAGES = 6;
   }
 }