diff --git a/{{cookiecutter.project_slug}}/README.md b/{{cookiecutter.project_slug}}/README.md
index 93e9bcf..75fb851 100644
--- a/{{cookiecutter.project_slug}}/README.md
+++ b/{{cookiecutter.project_slug}}/README.md
@@ -13,6 +13,9 @@
   # postgis 启用 gis 扩展
   CREATE DATABASE {{ cookiecutter.mvn_artifact_id }} WITH ENCODING = 'utf8';
   CREATE EXTENSION postgis;
+
+  # 开启 bigint 与 character 自动转换
+  CREATE CAST (character varying AS bigint) WITH INOUT AS IMPLICIT;
   ```
 
 2. 项目运行