diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 3777cfa52a..698169afdb 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -707,6 +707,12 @@ include_dir 'conf.d'
only be set at server start.
+
+ PostgreSQL sizes certain resources based directly on the value of
+ max_connections. Increasing its value leads to
+ higher allocation of those resources, including shared memory.
+
+
When running a standby server, you must set this parameter to the
same or higher value than on the primary server. Otherwise, queries