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 access/xlogrecord.h; 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
- 000000010000000000000000. The numbers do not wrap,
+ 000000010000000000000001. The numbers do not wrap,
but it will take a very, very long time to exhaust the
available stock of numbers.