diff --git a/chord/id.go b/chord/id.go
index 85d5c81..5e82235 100644
--- a/chord/id.go
+++ b/chord/id.go
@@ -16,10 +16,11 @@ func addrID(addr netip.AddrPort) ID {
 	}
 	b := make([]byte, 0, len("[ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff%enp5s0]:65535"))
 	b = addr.AppendTo(b)
-	return keyID(b)
+	return Key(b)
 }
 
-func keyID[T string | []byte](key T) ID {
+// Key obtains the ID for an arbitrary key.
+func Key[T string | []byte](key T) ID {
 	s := sha1.Sum([]byte(key))
 	return s
 }