man: document that "list-dependencies --reverse" is pretty incomplete

Fixes: #9681

diff --git a/man/systemctl.xml b/man/systemctl.xml
index 09cb03948afb878e9447b3087e4cd622fc4a81d9..2be5a838e010a119b71bc9ce33e84fcd62173aaa 100644 (file)
--- a/man/systemctl.xml
+++ b/man/systemctl.xml
@@ -1091,6 +1091,10 @@ Jan 12 10:46:45 example.com bluetoothd[8900]: gatt-time-server: Input/output err
             <option>--after</option>, <option>--before</option>
             may be used to change what types of dependencies
             are shown.</para>
+
+            <para>Note that this command only lists units currently loaded into memory by the service manager. In
+            particular, this command is not suitable to get a comprehensive list at all reverse dependencies on a
+            specific unit, as it won't list the dependencies declared by units currently not loaded.</para>
           </listitem>
         </varlistentry>
       </variablelist>