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diff --git a/man/gpsd.xml b/man/gpsd.xml
index 267dafe2..ad639819 100644
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+++ b/man/gpsd.xml
@@ -198,6 +198,8 @@ is associated with it. Some RS232 GPSes wait in a standby mode
some cellphone and handheld embedded GPSes have similar behaviors.
Accordingly, waiting for a watch request to open the device may save
battery power. (This capability is rare in consumer-grade devices).
+You should use this option if you plan to use gpsd to provide reference
+clock information to ntpd through a memory-shared segment.
</para>
</listitem>
</varlistentry>