> ## Documentation Index
> Fetch the complete documentation index at: https://www.plain.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# addAdditionalAssignees

> Add one or more users or machine users as additional (secondary) assignees on a thread. Additional assignees are looped in but are not the primary person responsible. Requires the `thread:assign` and `thread:read` permissions.