diff --git a/doc/src/sgml/wal.sgml b/doc/src/sgml/wal.sgml
index 4eb8feb903..bd9fae544c 100644
--- a/doc/src/sgml/wal.sgml
+++ b/doc/src/sgml/wal.sgml
@@ -758,7 +758,7 @@
    are described in <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>