# 如何修改主程序文件名

在使用dfx build命令编译项目的源代码之前，应验证用于程序源代码的位置和文件名。

例如，如果要为factorial 程序构建容器，并且该程序的源代码位于src/math/factorial.mo中，您应确保在配置文件的Canister部分指定了正确的路径。

例如：

```
"canisters": {
 "myFactorial": {
 "main": "src/math/factorial.mo",
```

请记住，更改程序文件名的配置设置仅会影响dfx build命令在哪里寻找要编译的源代码。在配置文件中进行更改不会重命名文件系统上的任何文件或目录。如果更改主程序文件的路径或文件名，请确保更改项目目录中的名称和位置。


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