diff --git a/procs/postgresql/dns_request.sql b/procs/postgresql/dns_request.sql
index dd04d8663..6724af223 100644
--- a/procs/postgresql/dns_request.sql
+++ b/procs/postgresql/dns_request.sql
@@ -1,4 +1,5 @@
 DROP TABLE IF EXISTS %RANDSTR1%;
+# https://wiki.postgresql.org/wiki/CREATE_OR_REPLACE_LANGUAGE <- if "CREATE LANGUAGE plpgsql" is required
 CREATE TABLE %RANDSTR1%(%RANDSTR2% text);
 CREATE OR REPLACE FUNCTION %RANDSTR3%()
 RETURNS VOID AS $$