Machine view. [Human page](/blog/when-a-document-changes) · [Markdown](/blog/when-a-document-changes.md)
# Stop outdated AI answers when a document changes
Blog · Human page: https://quelvio.com/blog/when-a-document-changes · Machine view: https://quelvio.com/ai/blog/when-a-document-changes
## When a document changes, every answer follows
Each new version is compared with the last, and every change is logged. Agents ask what changed, and old answers are marked "source changed since".
Policies change. The trouble starts when agents keep quoting the old version.
Each new version of a document is compared with the last, sentence by sentence, and every change is logged: what was there, what replaced it, and when.
Sample · A change, on History
```textWhat changed:
1 March 2026 · Travel and expenses policy · Meals · changed: "The daily meal allowance on business trips is 40 euros." → "The daily meal allowance on business trips is 45 euros."```## Agents ask what changed
Nothing is pushed into an agent. When an agent asks what has changed since a given time, it gets every change, and the lines it was given before are marked "served to you".
## Old answers are marked
An answer given before the change reads "source changed since". Opened again, it shows what was given at the time.
Sample · Past answers
```textWhat is the daily meal allowance on business trips? · 20 February 2026 · source changed since
The daily meal allowance on business trips is 40 euros.
Travel and expenses policy · Meals · 1 January 2026 (stated) · in force · official```## Every version, kept
Every version is in Quelvio's history, with what changed between them, for 12 months.
[Knowledge →](https://quelvio.com/knowledge)
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