@@ -675,8 +675,9 @@ include 'filename'
675675 an otherwise idle connection. A value of 0 uses the system default.
676676 This parameter is supported only on systems that support the
677677 <symbol>TCP_KEEPIDLE</> or <symbol>TCP_KEEPALIVE</> symbols, and on
678- Windows; on other systems, it must be zero. This parameter is ignored
679- for connections made via a Unix-domain socket.
678+ Windows; on other systems, it must be zero.
679+ In sessions connected via a Unix-domain socket, this parameter is
680+ ignored and always reads as zero.
680681 </para>
681682 <note>
682683 <para>
@@ -698,8 +699,9 @@ include 'filename'
698699 otherwise idle connection. A value of 0 uses the system default.
699700 This parameter is supported only on systems that support the
700701 <symbol>TCP_KEEPINTVL</> symbol, and on Windows; on other systems, it
701- must be zero. This parameter is ignored for connections made via a
702- Unix-domain socket.
702+ must be zero.
703+ In sessions connected via a Unix-domain socket, this parameter is
704+ ignored and always reads as zero.
703705 </para>
704706 <note>
705707 <para>
@@ -720,8 +722,9 @@ include 'filename'
720722 Specifies the number of keepalive packets to send on an otherwise idle
721723 connection. A value of 0 uses the system default. This parameter is
722724 supported only on systems that support the <symbol>TCP_KEEPCNT</>
723- symbol; on other systems, it must be zero. This parameter is ignored
724- for connections made via a Unix-domain socket.
725+ symbol; on other systems, it must be zero.
726+ In sessions connected via a Unix-domain socket, this parameter is
727+ ignored and always reads as zero.
725728 </para>
726729 <note>
727730 <para>