diff --git a/doc/src/sgml/ref/pg_ctl-ref.sgml b/doc/src/sgml/ref/pg_ctl-ref.sgml
index e61b2713628..7b9caf55127 100644
--- a/doc/src/sgml/ref/pg_ctl-ref.sgml
+++ b/doc/src/sgml/ref/pg_ctl-ref.sgml
@@ -1,5 +1,5 @@
@@ -237,7 +237,9 @@ PostgreSQL documentation
has been set in the postgresql.conf file.
If neither of those is used, it will use the default port that
PostgreSQL was compiled with
- (5432 by default).
+ (5432 by default). When waiting, pg_ctl will
+ return an accurate exit code based on the success of the startup
+ or shutdown.