diff --git a/README-EN.md b/README-EN.md
index 2dc1b50..1495970 100644
--- a/README-EN.md
+++ b/README-EN.md
@@ -308,6 +308,8 @@ cp .env.example .env
 vim .env
 ```
 
+> **Note:** The application reads database settings from `.env`. Keep `DB_DIALECT=postgresql` when using the bundled PostgreSQL service; change it only if you switch to another database engine.
+
 **Important environment variable configuration**:
 ```bash
 # LLM API configuration (required)
diff --git a/README.md b/README.md
index f24985a..8da49c6 100644
--- a/README.md
+++ b/README.md
@@ -322,6 +322,8 @@ cp .env.example .env
 vim .env
 ```
 
+> **提示：** 应用会从 `.env` 读取数据库相关配置。使用内置 PostgreSQL 时请保持 `DB_DIALECT=postgresql`，只有在切换到其他数据库引擎时再调整该值。
+
 **重要环境变量配置**：
 ```bash
 # LLM API配置（必需）