> ## Documentation Index
> Fetch the complete documentation index at: https://checkly-422f444a-paula-tree-202-entitlements-group-troubles.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Update the subscriptions of an alert channel

> Update the subscriptions of an alert channel. Use this to add a check to an alert channel so failure and recovery alerts are send out for that check. Note: when passing the subscription object, you can only specify a "checkId" or a "groupId, not both.