diff --git a/man/systemd-activate.xml b/man/systemd-activate.xml
index 5fe1a39057..c950a0836d 100644
--- a/man/systemd-activate.xml
+++ b/man/systemd-activate.xml
@@ -78,6 +78,9 @@
     to <command>systemd-activate</command> will be passed through to
     the daemon, in the original positions. Other sockets specified
     with <option>--listen</option> will use consecutive descriptors.
+    By default, <command>systemd-activate</command> listens on a
+    stream socket, use <option>--datagram</option> to listen on
+    a datagram socket instead (see below).
     </para>
   </refsect1>
 
@@ -103,6 +106,13 @@
         and standard output.</para></listitem>
       </varlistentry>
 
+      <varlistentry>
+        <term><option>-d</option></term>
+        <term><option>--datagram</option></term>
+
+        <listitem><para>Listen on a datagram socket, instead of a stream socket.</para></listitem>
+      </varlistentry>
+
       <varlistentry>
         <term><option>-E <replaceable>VAR</replaceable><optional>=<replaceable>VALUE</replaceable></optional></option></term>
         <term><option>--setenv=<replaceable>VAR</replaceable><optional>=<replaceable>VALUE</replaceable></optional></option></term>