diff --git a/source/configuration_manual/config_file/config_variables.rst b/source/configuration_manual/config_file/config_variables.rst
index 881328af2..b2352c754 100644
--- a/source/configuration_manual/config_file/config_variables.rst
+++ b/source/configuration_manual/config_file/config_variables.rst
@@ -112,6 +112,14 @@ Mail service user variables
 |          |                |                                                               |
 |          |                | .. versionchanged:: v2.3.14 variable long name changed        |
 +----------+----------------+---------------------------------------------------------------+
+| %a       | local_port     | local port                                                    |
+|          |                |                                                               |
+|          |                | .. versionadded:: v2.3.22                                     |
++----------+----------------+---------------------------------------------------------------+
+| %b       | remote_port    | remote port                                                   |
+|          |                |                                                               |
+|          |                | .. versionadded:: v2.3.22                                     |
++----------+----------------+---------------------------------------------------------------+
 | %i       | uid            | UNIX user identifier of the user                              |
 +----------+----------------+---------------------------------------------------------------+
 |          | gid            | UNIX group identifier of the user                             |