-[1] - Only required for serving/generating Atom and HTML pages.
-[3] - Optional for HTML web interface and HTTP/NNTP servers
-[4] - Optional for HTTP and NNTP servers
+[1] - Optional, needed for serving/generating Atom and HTML pages
+[2] - Optional, only required for NNTP server
+[3] - Optional, needed for gzipped mbox support over HTTP
+[4] - Optional, needed for bundled HTTP and NNTP servers
+[5] - Optional, needed for standalone daemonization of HTTP+NNTP servers
+[6] - Optional, needed for public-inbox-watch Maildir watcher