diff --git a/README.md b/README.md
index e84d43f..4f9db1d 100644
--- a/README.md
+++ b/README.md
@@ -85,3 +85,6 @@ em português num Windows configurado em português e pode ser forçada com
 ## License
 
 [MIT](LICENSE) © 2026 JC-OM
+
+Packaged builds include third-party libraries under their own licenses; see
+[THIRD_PARTY_NOTICES.md](THIRD_PARTY_NOTICES.md).
diff --git a/THIRD_PARTY_NOTICES.md b/THIRD_PARTY_NOTICES.md
new file mode 100644
index 0000000..d4cfd15
--- /dev/null
+++ b/THIRD_PARTY_NOTICES.md
@@ -0,0 +1,16 @@
+# Third-party notices
+
+Window Swap is MIT-licensed, but its packaged executable includes third-party
+Python libraries under their own licenses. Those licenses continue to govern
+their respective components.
+
+| Component | Purpose | License | Source |
+|---|---|---|---|
+| Pillow | Tray icon image creation | MIT-CMU | <https://github.com/python-pillow/Pillow> |
+| pystray | Windows system-tray integration | GNU LGPL v3 | <https://github.com/moses-palmer/pystray> |
+| pywin32 | Win32 and COM integration | Python Software Foundation License | <https://github.com/mhammond/pywin32> |
+| six | Python compatibility dependency of pystray | MIT | <https://github.com/benjaminp/six> |
+
+The exact resolved versions and package sources for a build are recorded in
+`uv.lock`. Complete license texts and notices supplied by these projects are
+available from their linked source repositories and installed distributions.