diff --git a/dnsapi/dns_pdnsMysql.sh b/dnsapi/dns_pdnsMysql.sh
index f04a40c3..b4e6ff49 100644
--- a/dnsapi/dns_pdnsMysql.sh
+++ b/dnsapi/dns_pdnsMysql.sh
@@ -135,7 +135,7 @@ rm_record() {
 
 notify_slaves() {
   root=$1
-
+  # hack set last_check to null to force update. #
   mysql -ss "-h${PDNS_Host}" "-P${PDNS_Port}" "-u${PDNS_User}" "-p${PDNS_Pass}" -e "UPDATE ${PDNS_Database}.domains SET last_check=NULL WHERE name='${root}';"
 
   return 0