# Modules & Commands

The following pages document the PX4 modules, drivers and commands. They describe the provided functionality, high-level implementation overview and how to use the command-line interface.

:::note **This is auto-generated from the source code** and contains the most recent modules documentation. :::

It is not a complete list and NuttX provides some additional commands as well (such as `free`). Use `help` on the console to get a list of all available commands, and in most cases `command help` will print the usage.

Since this is generated from source, errors must be reported/fixed in the [PX4-Autopilot](https://github.com/PX4/PX4-Autopilot) repository. The documentation pages can be generated by running the following command from the root of the PX4-Autopilot directory:

```
make module_documentation
```

The generated files will be written to the `modules` directory.

## Categories

* [Autotune](https://px4.gitbook.io/px4-user-guide/development/modules_main/modules_autotune)
* [Command](https://px4.gitbook.io/px4-user-guide/development/modules_main/modules_command)
* [Communication](https://px4.gitbook.io/px4-user-guide/development/modules_main/modules_communication)
* [Controller](https://px4.gitbook.io/px4-user-guide/development/modules_main/modules_controller)
* [Driver](https://px4.gitbook.io/px4-user-guide/development/modules_main/modules_driver)
* [Estimator](https://px4.gitbook.io/px4-user-guide/development/modules_main/modules_estimator)
* [Simulation](https://px4.gitbook.io/px4-user-guide/development/modules_main/modules_simulation)
* [System](https://px4.gitbook.io/px4-user-guide/development/modules_main/modules_system)
* [Template](https://px4.gitbook.io/px4-user-guide/development/modules_main/modules_template)


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