diff --git a/misc/update_1.5_to_1.6.sql b/misc/update_1.5_to_1.6.sql
new file mode 100644
index 0000000..dc2e736
--- /dev/null
+++ b/misc/update_1.5_to_1.6.sql
@@ -0,0 +1,28 @@
+CREATE TABLE `port` (
+  `id` int unsigned NOT NULL AUTO_INCREMENT,
+  `name` varchar(128) NOT NULL COMMENT 'Name of port',
+  `locode` char(5) DEFAULT NULL COMMENT 'UNECE locode',  
+  `created` datetime DEFAULT CURRENT_TIMESTAMP,
+  `modified` datetime DEFAULT NULL ON UPDATE CURRENT_TIMESTAMP,
+  `deleted` bit(1) DEFAULT b'0',
+  PRIMARY KEY (`id`) 
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci COMMENT='Port as reference for shipcalls and berths';
+
+-- Add default port to table
+INSERT INTO port (id, name, locode) VALUES (1, 'Bremen', 'DEBRE');
+
+-- Adding new ref column to berth
+ALTER TABLE `bremen_calling_devel`.`berth` 
+ADD COLUMN `port_id` INT UNSIGNED NOT NULL DEFAULT 1 AFTER `authority_id`;
+ALTER TABLE `bremen_calling_devel`.`berth` ALTER INDEX `FK_AUTHORITY_PART_idx` INVISIBLE;
+
+-- adding a foreign key berth.port_id -> port.id
+ALTER TABLE `bremen_calling_devel`.`berth` 
+ADD INDEX `FK_PORT_PART_idx` (`port_id` ASC) VISIBLE;
+
+ALTER TABLE `bremen_calling_devel`.`berth` 
+ADD CONSTRAINT `FK_PORT`
+  FOREIGN KEY (`port_id`)
+  REFERENCES `bremen_calling_devel`.`port` (`id`)
+  ON DELETE RESTRICT
+  ON UPDATE RESTRICT;