> ## 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.

# Manage the navigation

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The help center index defines the order in which article groups and articles appear in the help center navigation, as well as the parent-child relationships between them.

`updateHelpCenterIndex` replaces the entire navigation tree in a single call. To avoid clobbering concurrent edits, you must include the `hash` returned by the previous `helpCenterIndex` query — if the help center has been re-indexed since you read it, the call will fail and you should re-fetch the latest index and re-apply your changes.

Each entry references an existing article or article group by ID, and optionally a parent group ID to nest it within a group.

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