man: document explicitly that network-online.target doesn't track connectivity state...

Fixes: #5909

diff --git a/man/systemd.special.xml b/man/systemd.special.xml
index bb0c79637738f968ffedb395015cbfecc2b703c6..30fd8f6b0c22331a5495fb07f91ae8751ba97ef8 100644 (file)
--- a/man/systemd.special.xml
+++ b/man/systemd.special.xml
@@ -443,6 +443,10 @@
           it. Note that networking daemons that simply provide
           functionality to other hosts generally do not need to pull
           this in.</para>
+
+          <para>Note that this unit is only useful during the original system start-up logic. After the system has
+          completed booting up, it will not track the online state of the system anymore. Due to this it cannot be used
+          as a network connection monitor concept, it is purely a one-time system start-up concept.</para>
           </listitem>
       </varlistentry>
       <varlistentry>