diff --git a/README.md b/README.md
index e5ae594..9481bf4 100644
--- a/README.md
+++ b/README.md
@@ -27,6 +27,22 @@ Storage:
 ## Running
 
 Using the IMAP authentication backend and the filesystem storage backend
-(directory must exist):
+(directory must exist), listening on port 8080 on all interfaces:
 
-* `./tokidoki -auth.url imaps://imap.example.com:993 -storage.url file:///path/to/storage -debug`
+* `./tokidoki -addr ":8080" -auth.url imaps://imap.example.com:993 -storage.url file:///path/to/storage -debug`
+
+Tokidoki does not support HTTPS at this time, use a reverse TLS proxy if
+needed.
+
+## Usage
+
+Only a single address book and calendar per user are supported at the moment,
+this is currently a [limitation in go-webdav][2].
+
+Tokidoki supports calendar and address book auto-discovery via
+`/.well-known/caldav` and `/.well-known/carddav` respectively, as defined in
+[RFC 6764, section 6][3]. Hence, most clients should be able to discover
+resources by just pointing them at the server root.
+
+[2]: https://github.com/emersion/go-webdav/issues/26
+[3]: https://datatracker.ietf.org/doc/html/rfc6764#section-6