Speech-dispatcher handling improved.

README.md

@@ -199,6 +199,11 @@ Speech drivers are `speech-dispatcher`, `dectalk`, `dectalk-usb`, `litetalk`,
 `doubletalk`, and `tripletalk`. Serial drivers need a device path. The Speech
 settings tab includes a **Test synthesizer** button for hardware drivers.
 
+Speech Dispatcher connections support `SPEECHD_ADDRESS` (Unix socket or TCP),
+`SPEECHD_SOCKET`, runtime/cache-directory defaults, and bounded daemon autostart.
+See [speech synthesizers](docs/user.md#speech-synthesizers) for precedence and
+sudo behavior.
+
 Clipboard persistence is optional and off by default. It stores unencrypted
 history separately for console and terminal sessions. X clipboard sync is
 controlled by `clipboard.sync`.