diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
new file mode 100644
index 6d39ce7..0961147
*** a/doc/src/sgml/runtime.sgml
--- b/doc/src/sgml/runtime.sgml
*************** postgres$ <userinput>initdb -D /usr/loca
*** 188,195 ****
     operating system's collation library for character set ordering.
     This controls the ordering of keys stored in indexes.  For this reason,
     a cluster cannot switch to an incompatible collation library version,
!    either through snapshot restore, binary streaming replication, or
!    <application>pg_upgrade</> run.
    </para>
  
    <sect2 id="creating-cluster-mount-points">
--- 188,196 ----
     operating system's collation library for character set ordering.
     This controls the ordering of keys stored in indexes.  For this reason,
     a cluster cannot switch to an incompatible collation library version,
!    either through snapshot restore, binary streaming replication,
!    <application>pg_upgrade</> run, a different operating system, or an
!    operating system upgrade.
    </para>
  
    <sect2 id="creating-cluster-mount-points">