/enums/user_list_type.proto

--- v14/enums/user_list_type.proto  2023-10-18 04:25:30.000000000 +0000
+++ v15/enums/user_list_type.proto  2023-10-18 04:25:34.000000000 +0000
@@ -55,5 +55,9 @@
     // UserList of first-party CRM data provided by advertiser in the form of
     // emails or other formats.
     CRM_BASED = 7;
+
+    // LookalikeUserlist, composed of users similar to those
+    // of a configurable seed (set of UserLists)
+    LOOKALIKE = 9;
   }
 }