diff --git a/doc/src/sgml/protocol.sgml b/doc/src/sgml/protocol.sgml
index 508991bcc2b..84d39e191cb 100644
--- a/doc/src/sgml/protocol.sgml
+++ b/doc/src/sgml/protocol.sgml
@@ -1742,6 +1742,11 @@ The commands accepted in walsender mode are:
          <filename>postmaster.pid</>
         </para>
        </listitem>
+       <listitem>
+        <para>
+         <filename>postmaster.opts</>
+        </para>
+       </listitem>
        <listitem>
         <para>
          <filename>pg_xlog</>, including subdirectories. If the backup is run