diff --git a/man/systemd.socket.xml b/man/systemd.socket.xml
index 28c8dc4566..2f3124288b 100644
--- a/man/systemd.socket.xml
+++ b/man/systemd.socket.xml
@@ -524,6 +524,17 @@
                                 <option>false</option>.</para></listitem>
                         </varlistentry>
 
+                        <varlistentry>
+                                <term><varname>PassCred=</varname></term>
+                                <listitem><para>Takes a boolean
+                                value. This controls the SO_PASSCRED
+                                option, which allows UNIX sockets to
+                                receive the credentials of the sending
+                                process in an ancillary message.
+                                Defaults to
+                                <option>false</option>.</para></listitem>
+                        </varlistentry>
+
                         <varlistentry>
                                 <term><varname>TCPCongestion=</varname></term>
                                 <listitem><para>Takes a string