diff --git a/runtime/doc/channel.txt b/runtime/doc/channel.txt
index 42e00c7..e0e1c24 100644
--- a/runtime/doc/channel.txt
+++ b/runtime/doc/channel.txt
@@ -1,4 +1,4 @@
-*channel.txt*      For Vim version 8.2.  Last change: 2019 Dec 07
+*channel.txt*      For Vim version 8.2.  Last change: 2020 Jun 01
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -1235,8 +1235,8 @@
 - Use a terminal window.  This works well if what you type goes directly to
   the job and the job output is directly displayed in the window.
   See |terminal-window|.
-- Use a prompt window. This works well when entering a line for the job in Vim
-  while displaying (possibly filtered) output from the job.
+- Use a window with a prompt buffer. This works well when entering a line for
+  the job in Vim while displaying (possibly filtered) output from the job.
 
 A prompt buffer is created by setting 'buftype' to "prompt". You would
 normally only do that in a newly created buffer.
@@ -1270,5 +1270,46 @@
 the cursor to the last line.  "A" will move to the end of the line, "I" to the
 start of the line.
 
+Here is an example for Unix.  It starts a shell in the background and prompts
+for the next shell command.  Output from the shell is displayed above the
+prompt. >
+
+	" Create a channel log so we can see what happens.
+	call ch_logfile('logfile', 'w')
+
+	" Function handling a line of text has been typed.
+	func TextEntered(text)
+	  " Send the text to a shell with Enter appended.
+	  call ch_sendraw(g:shell_job, a:text .. "\n")
+	endfunc
+		
+	" Function handling output from the shell: Added above the prompt.
+	func GotOutput(channel, msg)
+	  call append(line("$") - 1, "- " . a:msg)
+	endfunc
+
+	" Function handling the shell exist: close the window.
+	func JobExit(job, status)
+	  quit!
+	endfunc
+
+	" Start a shell in the background.
+	let shell_job = job_start(["/bin/sh"], #{
+		\ out_cb: function('GotOutput'),
+		\ err_cb: function('GotOutput'),
+		\ exit_cb: function('JobExit'),
+		\ })
+	let shell_ch = job_getchannel(shell_job)
+
+	new
+	set buftype=prompt
+	let buf = bufnr('')
+	call prompt_setcallback(buf, function("TextEntered"))
+	eval prompt_setprompt(buf, "shell command: ")
+
+	" start accepting shell commands
+	startinsert
+<
+
 
  vim:tw=78:ts=8:noet:ft=help:norl: