diff --git a/doc/src/sgml/protocol.sgml b/doc/src/sgml/protocol.sgml
index a5cb19357f..11f75cd3d6 100644
--- a/doc/src/sgml/protocol.sgml
+++ b/doc/src/sgml/protocol.sgml
@@ -3141,6 +3141,13 @@ psql "dbname=postgres replication=database" -c "IDENTIFY_SYSTEM;"
+
+
+ In all the above commands,
+ when specifying a parameter of type boolean the
+ value part can be omitted,
+ which is equivalent to specifying TRUE.
+