diff --git a/doc/src/sgml/ref/pg_waldump.sgml b/doc/src/sgml/ref/pg_waldump.sgml
index 35f974f8c1b..389c314ef3b 100644
--- a/doc/src/sgml/ref/pg_waldump.sgml
+++ b/doc/src/sgml/ref/pg_waldump.sgml
@@ -23,9 +23,7 @@ PostgreSQL documentation
   <cmdsynopsis>
    <command>pg_waldump</command>
    <arg rep="repeat" choice="opt"><option>option</option></arg>
-   <arg choice="opt"><option>startseg</option>
-    <arg choice="opt"><option>endseg</option></arg>
-   </arg>
+   <arg choice="opt"><option>startseg</option><arg choice="opt"><option>endseg</option></arg></arg>
   </cmdsynopsis>
  </refsynopsisdiv>