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-rw-r--r--doc/src/sgml/release-13.sgml5
1 files changed, 4 insertions, 1 deletions
diff --git a/doc/src/sgml/release-13.sgml b/doc/src/sgml/release-13.sgml
index 18e6497a7f2..0b1051ba824 100644
--- a/doc/src/sgml/release-13.sgml
+++ b/doc/src/sgml/release-13.sgml
@@ -649,7 +649,10 @@ Author: Jeff Davis <jdavis@postgresql.org>
<para>
Previously, hash aggregation was avoided if it was expected to use
- more than <xref linkend="guc-work-mem"/> memory.
+ more than <xref linkend="guc-work-mem"/> memory. To reduce the
+ likelihood of using disk storage for hash aggregation and attain
+ behavior similar to previous Postgres releases, increase <xref
+ linkend="guc-hash-mem-multiplier"/>.
</para>
</listitem>