> For the complete documentation index, see [llms.txt](https://wiki.acala.network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://wiki.acala.network/build/development-guide/composable-chains/open-hrmp-channel.md).

# Open HRMP Channel

{% embed url="<https://docs.substrate.io/reference/how-to-guides/parachains/add-hrmp-channels/>" %}