diff --git a/README.md b/README.md
index c1ce1e7afbf55a5c276424fd3423eeafd6b3d411..ddfead1dd2a9a620e0528006979249c8746526b8 100644
--- a/README.md
+++ b/README.md
@@ -104,6 +104,7 @@ should show up in the network list on Riot and other clients.
 
 * For the bot to appear online on Discord you need to run the bridge itself.
 * ``npm start``
+* Particular configuration keys can be overridden by defining corresponding environment variables. For instance, `auth.botToken` can be set with `APPSERVICE_DISCORD_AUTH_BOT_TOKEN`.
 
 [Howto](./docs/howto.md)