/resources/campaign_criterion.proto 

--- v19/resources/campaign_criterion.proto  2025-08-05 14:37:39.000000000 +0000
+++ v20/resources/campaign_criterion.proto  2025-08-05 14:37:45.000000000 +0000
@@ -210,11 +210,16 @@
         [(google.api.field_behavior) = IMMUTABLE];

     // Immutable. GLS service campaign criterion.
-    google.ads.googleads.v19.common.LocalServiceIdInfo local_service_id = 46
+    google.ads.googleads.v20.common.LocalServiceIdInfo local_service_id = 46
         [(google.api.field_behavior) = IMMUTABLE];

     // Immutable. Brand list campaign criterion.
-    google.ads.googleads.v19.common.BrandListInfo brand_list = 47
+    google.ads.googleads.v20.common.BrandListInfo brand_list = 47
+        [(google.api.field_behavior) = IMMUTABLE];
+
+    // Immutable. Webpage list.
+    // This criterion is not publicly available.
+    google.ads.googleads.v20.common.WebpageListInfo webpage_list = 49
         [(google.api.field_behavior) = IMMUTABLE];
   }
 }