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-rw-r--r--doc/src/sgml/catalogs.sgml4
1 files changed, 3 insertions, 1 deletions
diff --git a/doc/src/sgml/catalogs.sgml b/doc/src/sgml/catalogs.sgml
index 49a881b2621..003d2783703 100644
--- a/doc/src/sgml/catalogs.sgml
+++ b/doc/src/sgml/catalogs.sgml
@@ -11214,7 +11214,9 @@ SELECT * FROM pg_locks pl LEFT JOIN pg_prepared_xacts ppx
<para>
The address (<literal>LSN</literal>) of oldest WAL which still
might be required by the consumer of this slot and thus won't be
- automatically removed during checkpoints. <literal>NULL</literal>
+ automatically removed during checkpoints unless this LSN
+ gets behind more than <xref linkend="guc-max-slot-wal-keep-size"/>
+ from the current LSN. <literal>NULL</literal>
if the <literal>LSN</literal> of this slot has never been reserved.
</para></entry>
</row>