diff --git a/doc/src/sgml/wal.sgml b/doc/src/sgml/wal.sgml
index a421dc2fbac..f0a95e6db13 100644
--- a/doc/src/sgml/wal.sgml
+++ b/doc/src/sgml/wal.sgml
@@ -732,7 +732,7 @@
    <filename>access/xlogrecord.h</filename>; the record content is dependent
    on the type of event that is being logged.  Segment files are given
    ever-increasing numbers as names, starting at
-   <filename>000000010000000000000000</filename>.  The numbers do not wrap,
+   <filename>000000010000000000000001</filename>.  The numbers do not wrap,
    but it will take a very, very long time to exhaust the
    available stock of numbers.
   </para>