diff --git a/README.md b/README.md
index ce60fc4..d0234c6 100644
--- a/README.md
+++ b/README.md
@@ -17,13 +17,13 @@ Full documentation at **[docs.ewancroft.uk](https://docs.ewancroft.uk/projects/p
 | [`@ewanc26/noise`](./packages/noise)                               | Deterministic value-noise generation                                 |
 | [`@ewanc26/noise-avatar`](./packages/noise-avatar)                 | Noise-based avatar generation                                        |
 | [`@ewanc26/bismuth`](./packages/bismuth)                           | Convert `pub.leaflet` / `site.standard.document` records to Markdown |
-| [`@ewanc26/svelte-standard-site`](./packages/svelte-standard-site) | SvelteKit library for `site.standard.*` ATProto records              |
-| [`@ewanc26/pds-landing`](./packages/pds-landing)                   | Svelte components for an ATProto PDS landing page                    |
-| [`@ewanc26/supporters`](./packages/supporters)                     | Ko-fi supporter display backed by ATProto                            |
+| [`@ewanc26/svelte-standard-site`](./packages/svelte-standard-site) | SvelteKit library for `site.standard.*` AT Protocol records          |
+| [`@ewanc26/pds-landing`](./packages/pds-landing)                   | Svelte components for an AT Protocol PDS landing page                |
+| [`@ewanc26/supporters`](./packages/supporters)                     | Ko-fi supporter display backed by AT Protocol                        |
 | [`@ewanc26/wafrn-theme`](./packages/wafrn-theme)                   | WAFRN CSS theme — Catppuccin terminal aesthetic                      |
 | [`@ewanc26/tangled-sync`](./packages/tangled-sync)                 | CLI for syncing GitHub repos to Tangled                              |
-| [`malachite`](./packages/malachite)                                | Last.fm/Spotify → ATProto scrobble importer (CLI)                    |
-| [`malachite-web`](./packages/malachite-web)                        | Last.fm/Spotify → ATProto scrobble importer (web frontend, private)  |
+| [`malachite`](./packages/malachite)                                | Last.fm/Spotify → AT Protocol scrobble importer (CLI)                |
+| [`malachite-web`](./packages/malachite-web)                        | Last.fm/Spotify → AT Protocol scrobble importer (web frontend, private) |
 | [`nix-config-tools`](./packages/nix-config-tools)                  | Nix config management tools (Rust)                                   |
 | [`llm-analyser`](./packages/llm-analyser)                          | `.docx` analysis with Ollama (Python)                                |
 
diff --git a/TRADEMARKS.md b/TRADEMARKS.md
new file mode 100644
index 0000000..f3e0281
--- /dev/null
+++ b/TRADEMARKS.md
@@ -0,0 +1,10 @@
+# Trademark notice
+
+The projects and packages in this repository, including `@ewanc26/atproto`,
+are independent and are not affiliated with or endorsed by Bluesky Social PBC.
+
+“AT Protocol”, “atproto”, and “atprotocol” are trademarks owned by Bluesky
+Social PBC. Their use in package names and documentation describes compatibility
+with and tooling for the AT Protocol.
+
+See the [AT Protocol trademark policy](https://atproto.com/about/trademarks/atproto-trademark-policy).
diff --git a/packages/atproto/README.md b/packages/atproto/README.md
index 1dc258c..b3b65dc 100644
--- a/packages/atproto/README.md
+++ b/packages/atproto/README.md
@@ -2,6 +2,10 @@
 
 AT Protocol service layer — identity resolution, record fetching, Bluesky posts, Standard.site documents, music/mood status, and more.
 
+> **Trademark notice:** `@ewanc26/atproto` is an independent package and is not
+> affiliated with or endorsed by Bluesky Social PBC. See the repository's
+> [trademark notice](../../TRADEMARKS.md).
+
 ```bash
 pnpm add @ewanc26/atproto
 ```