doc: OS collation changes can break indexes

Discussion: 20160702155517[email protected]

Reviewed-by: Christoph Berg
Backpatch-through: 9.1

diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index 09e1653c2c16fafee3a29b258192d4ecedb0e24c..eed55dd6db4274991d162687cc7e920337f81a37 100644 (file)
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -188,8 +188,8 @@ postgres$ initdb -D /usr/local/pgsql/data
    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
-   pg_upgrade run.
+   either through snapshot restore, binary streaming replication, a
+   different operating system, or an operating system upgrade.