diff --git a/README.md b/README.md
index 19280b5..a795d6c 100644
--- a/README.md
+++ b/README.md
@@ -46,6 +46,10 @@ Outpost itself is licensed under the [Business Source License 1.1](./LICENSE) 
 
 This project is a client only — it does not include, vendor, or redistribute any of Outline's own (also BSL 1.1 licensed) server source.
 
+## Credits
+
+The native markdown editor is built on [swift-markdown-engine](https://github.com/nodes-app/swift-markdown-engine) by Luca Chen, licensed under Apache License 2.0. It's vendored directly in [`Vendor/swift-markdown-engine`](./Vendor/swift-markdown-engine) (see its [`LICENSE`](./Vendor/swift-markdown-engine/LICENSE)); local fixes made in that copy haven't been upstreamed yet.
+
 ## Privacy
 
 Outpost collects nothing about you — no analytics, no telemetry, no crash reporting of its own, no age or demographic data, nothing. The only thing stored locally is your Outline server URL and API token (in the device Keychain) and, optionally, a local offline cache of what you've viewed. Everything else goes straight from your device to whatever Outline server you configure — there's no backend in between, and the developer has no access to your data or your server.