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-rw-r--r--doc/src/sgml/ref/pg_createsubscriber.sgml7
1 files changed, 7 insertions, 0 deletions
diff --git a/doc/src/sgml/ref/pg_createsubscriber.sgml b/doc/src/sgml/ref/pg_createsubscriber.sgml
index 26b8e64a4e0..d56487fe2ca 100644
--- a/doc/src/sgml/ref/pg_createsubscriber.sgml
+++ b/doc/src/sgml/ref/pg_createsubscriber.sgml
@@ -377,6 +377,13 @@ PostgreSQL documentation
server. If the target server has a standby, replication will break and a
fresh standby should be created.
</para>
+
+ <para>
+ Replication failures can occur if required WAL files are missing. To prevent
+ this, the source server must set
+ <xref linkend="guc-max-slot-wal-keep-size"/> to <literal>-1</literal> to
+ ensure that required WAL files are not prematurely removed.
+ </para>
</refsect2>
<refsect2>