diff --git a/mysql/docker-entrypoint-initdb.d/createdb.sql.example b/mysql/docker-entrypoint-initdb.d/createdb.sql.example
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index 0000000..6420afb
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+++ b/mysql/docker-entrypoint-initdb.d/createdb.sql.example
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+#
+# Copy createdb.sql.example to createdb.sql
+# then uncomment then set database name and username to create you need databases
+#
+# example: .env MYSQL_USER=appuser and need db name is myshop_db
+#
+#    CREATE DATABASE IF NOT EXISTS `myshop_db` ;
+#    GRANT ALL ON `myshop_db`.* TO 'appuser'@'%' ;
+#
+#
+# this sql script will auto run when the mysql container starts and the $DATA_PATH_HOST/mysql not found.
+#
+# if your $DATA_PATH_HOST/mysql exists and you do not want to delete it, you can run by manual execution:
+#
+#     docker-compose exec mysql bash
+#     mysql -u root -p < /docker-entrypoint-initdb.d/createdb.sql
+#
+
+#CREATE DATABASE IF NOT EXISTS `dev_db_1` COLLATE 'utf8_general_ci' ;
+#GRANT ALL ON `dev_db_1`.* TO 'default'@'%' ;
+
+#CREATE DATABASE IF NOT EXISTS `dev_db_2` COLLATE 'utf8_general_ci' ;
+#GRANT ALL ON `dev_db_2`.* TO 'default'@'%' ;
+
+#CREATE DATABASE IF NOT EXISTS `dev_db_3` COLLATE 'utf8_general_ci' ;
+#GRANT ALL ON `dev_db_3`.* TO 'default'@'%' ;
+
+FLUSH PRIVILEGES ;