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

# Changelog

> Changes to the Pylon Developer Platform API, with advance notice of anything that affects an existing integration.

Changes to the Pylon Developer Platform API, newest first. Subscribe with the RSS button above.

* **Minor change**: a change to existing behavior that most integrations absorb without modification. Announced at least **2 weeks** before it takes effect.
* **Major change**: a change likely to require an update to your integration. Announced at least **4 weeks** before it takes effect.

<Update label="September 8, 2026" description="Minor change" rss={{ title: "Loan notes limited to 10,000 bytes", description: "submitUnderwritingNotes and attachLoanNote will reject notes longer than 10,000 UTF-8 bytes, taking effect no earlier than September 22, 2026 and enabled per customer." }}>
  ## Changed

  * **Loan notes**: we're introducing a 10,000-byte limit on the `notes` value accepted by `submitUnderwritingNotes` and `attachLoanNote`, taking effect no earlier than September 22, 2026. The limit is measured as UTF-8 encoded length. Plain ASCII text fits 10,000 characters; accented characters use 2 bytes each and most emoji use 4. Once enabled for your account, a longer `notes` value will return the error code `LOAN_NOTE_TOO_LONG`, and the request will be rejected. Today, notes of any length are accepted via API request.

    We recommend truncating or splitting note content that exceeds the limit, and handling `LOAN_NOTE_TOO_LONG` if you surface API errors to your users.

  ## Fixed

  * **Loan notes**: notes that exceed the underlying storage limit now return `LOAN_OPERATION_ERROR` rather than `LOAN_INVALID_STATE`, which more accurately describes the failure. This applies to all customers and is not gated by the rollout above.
</Update>