diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index 883a849e6f..2f7c618886 100644
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -884,7 +884,8 @@ psql: error: connection to server on socket "/tmp/.s.PGSQL.5432" failed: No such
     When using POSIX semaphores, the number of semaphores needed is the
     same as for System V, that is one semaphore per allowed connection
     (<xref linkend="guc-max-connections"/>), allowed autovacuum worker process
-    (<xref linkend="guc-autovacuum-max-workers"/>) and allowed background
+    (<xref linkend="guc-autovacuum-max-workers"/>), allowed WAL sender process
+    (<xref linkend="guc-max-wal-senders"/>), and allowed background
     process (<xref linkend="guc-max-worker-processes"/>).
     On the platforms where this option is preferred, there is no specific
     kernel limit on the number of POSIX semaphores.