diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index bd70ff2e4b..c3e40a548e 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -705,6 +705,12 @@ include_dir 'conf.d'
         only be set at server start.
        </para>
 
+       <para>
+        PostgreSQL sizes certain resources based directly on the value of
+        <varname>max_connections</varname>. Increasing its value leads to
+        higher allocation of those resources, including shared memory.
+       </para>
+
        <para>
         When running a standby server, you must set this parameter to the
         same or higher value than on the primary server. Otherwise, queries