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diff --git a/man/systemctl.xml b/man/systemctl.xml
index 31f3b1a90..62446d7a5 100644
--- a/man/systemctl.xml
+++ b/man/systemctl.xml
@@ -106,6 +106,11 @@
                                 certain unit types. If not specified
                                 units of in all load states will be
                                 shown.</para>
+
+                                <para>As a special case, if the argument
+                                is <option>help</option>, a list of
+                                allowed values will be printed and the
+                                program will exit.</para>
                                 </listitem>
                         </varlistentry>