Add a comment: Any new lists must already be supported by the SB server

components/safe_browsing_db/v4_local_database_manager.cc

Index: components/safe_browsing_db/v4_local_database_manager.cc
diff --git a/components/safe_browsing_db/v4_local_database_manager.cc b/components/safe_browsing_db/v4_local_database_manager.cc
index bed076fa0b605a410e678ba259c90dcaefc388c6..45aad8e0e9ba29952d476f656914e646297fa4d8 100644
--- a/components/safe_browsing_db/v4_local_database_manager.cc
+++ b/components/safe_browsing_db/v4_local_database_manager.cc
@@ -76,6 +76,9 @@ ListInfos GetListInfos() {
       ListInfo(kSyncOnlyOnChromeBuilds, "UrlSubresourceFilter.store",
                GetUrlSubresourceFilterId(), SB_THREAT_TYPE_SUBRESOURCE_FILTER),
   });
+  // NOTE(vakh): IMPORTANT: Please make sure that the server already supports
+  // any list before adding it to this list otherwise the prefix updates break
+  // for all Canary users.
 }
 
 // Returns the severity information about a given SafeBrowsing list. The lowest