; * src/w32proc.c: Update the commentary to sys_select.

src/w32proc.c

@@ -2062,10 +2062,11 @@ sys_spawnve (int mode, char *cmdname, char **argv, char **envp)
   return pid;
 }
 
-/* Emulate the select call
+/* Emulate the select call.
    Wait for available input on any of the given rfds, or timeout if
-   a timeout is given and no input is detected
-   wfds and efds are not supported and must be NULL.
+   a timeout is given and no input is detected.  wfds are supported
+   only for asynchronous 'connect' calls.  efds are not supported
+   and must be NULL.
 
    For simplicity, we detect the death of child processes here and
    synchronously call the SIGCHLD handler.  Since it is possible for