diff --git a/README.md b/README.md
index 8e83740..9099702 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,7 @@
 **INBUXA** is a mail and collaboration server: JMAP, IMAP, POP3, SMTP,
 CalDAV, CardDAV and WebDAV, in one Rust binary, with ihasmail as its web front
 end. It is a fork of [Stalwart](https://github.com/stalwartlabs/stalwart).
+Project site: [inbuxa.org](https://inbuxa.org) (not up yet).
 
 Stalwart ships some features only in a paid Enterprise Edition: multi-tenancy,
 masked email, undelete and others. INBUXA ships everything to everybody under
diff --git a/crates/imap/src/op/capability.rs b/crates/imap/src/op/capability.rs
index f16d6b4..e1ac102 100644
--- a/crates/imap/src/op/capability.rs
+++ b/crates/imap/src/op/capability.rs
@@ -72,6 +72,8 @@ impl<T: SessionStream> Session<T> {
                         types::brand!(),
                         "\" \"version\" \"1.0.0\" \"vendor\" \"",
                         types::brand!(),
+                        "\" \"support-url\" \"",
+                        types::brand_url!(),
                         "\")\r\n"
                     )
                     .as_bytes()
diff --git a/crates/types/src/branding.rs b/crates/types/src/branding.rs
index 049c98a..c6d1680 100644
--- a/crates/types/src/branding.rs
+++ b/crates/types/src/branding.rs
@@ -37,3 +37,11 @@ macro_rules! brand_prodid {
         concat!("-//", $crate::brand!(), "//", $crate::brand_server!(), "//EN")
     };
 }
+
+/// The project's website, given to clients as the support URL (IMAP `ID`).
+#[macro_export]
+macro_rules! brand_url {
+    () => {
+        "https://inbuxa.org"
+    };
+}