diff --git a/doc/src/sgml/pgupgrade.sgml b/doc/src/sgml/pgupgrade.sgml index 6d2cdaa335..9081cc916a 100644 --- a/doc/src/sgml/pgupgrade.sgml +++ b/doc/src/sgml/pgupgrade.sgml @@ -21,7 +21,8 @@ regularly added to PostgreSQL major releases, the internal data storage format rarely changes. pg_upgrade does its best to make sure the old and new clusters are binary-compatible, e.g. by - checking for compatible compile-time settings. It is important that + checking for compatible compile-time settings, including 32/64-bit + binaries. It is important that any external modules are also binary compatible, though this cannot be checked by pg_upgrade.