From 3d42e4b42964f4cec4e8d9f06ddf80c956dbfbb2 Mon Sep 17 00:00:00 2001
From: Laurent Bercot <ska-skaware@skarnet.org>
Date: Sun, 20 Aug 2017 10:10:19 +0000
Subject:  Doc updates

---
 doc/notifywhenup.html | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'doc/notifywhenup.html')

diff --git a/doc/notifywhenup.html b/doc/notifywhenup.html
index 363438b..d788938 100644
--- a/doc/notifywhenup.html
+++ b/doc/notifywhenup.html
@@ -79,5 +79,17 @@ to provide reliable startup notifications, and subscribers should then
 be content with the unreliable <tt>'u'</tt> events provided by s6-supervise.
 </p>
 
+<p>
+Unfortunately, a lot of long-running programs do not offer that
+functionality; instead, they provide a way to poll them, an external
+program that runs and checks whether the service is ready. This is a
+<a href="//skarnet.org/software/s6/ftrig.html">bad</a> mechanism, for
+<a href="//skarnet.org/cgi-bin/archive.cgi?2:mss:1607:dfblejammjllfkggpcph">several</a>
+reasons. Nevertheless, until all daemons are patched to notify their
+own readiness, s6 provides a way to run such a check program to poll
+for readiness, and route its result into the s6 notification system:
+<a href="s6-notifyoncheck.html">s6-notifyoncheck</a>.
+</p>
+
 </body>
 </html>
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