diff --git a/classes/local/outagelib.php b/classes/local/outagelib.php
index 7d5b340..42be2f5 100644
--- a/classes/local/outagelib.php
+++ b/classes/local/outagelib.php
@@ -246,6 +246,7 @@ class outagelib {
                 unset_config('maintenance_message');
             }
             set_config('maintenance_later', $outage->starttime);
+            self::maintenance_config_log($outage);
         }
     }
 
@@ -414,4 +415,21 @@ EOT;
 
         return $message;
     }
+
+    /**
+     * Logging for maintenance mode configuration.
+     *
+     * @param outage|null $outage Outage or null if no scheduled outage.
+     */
+    private static function maintenance_config_log(outage $outage) {
+        // Not output logging info in php unit test.
+        if (PHPUNIT_TEST) return;
+
+        mtrace(get_string('logformaintmodeconfig', 'auth_outage'));
+        $timezone = ' (Timezone ' . \core_date::get_server_timezone_object()->getName() . ')';
+        mtrace('... updated at ' . date('H:i:s'));
+        $time = date("Y-m-d H:i:s", $outage->starttime);
+        mtrace("... enable maintenance mode at $time $timezone");
+        mtrace(get_string('logformaintmodeconfigcomplete', 'auth_outage'));
+    }
 }
diff --git a/lang/en/auth_outage.php b/lang/en/auth_outage.php
index 0324a19..80ca4a3 100644
--- a/lang/en/auth_outage.php
+++ b/lang/en/auth_outage.php
@@ -107,6 +107,8 @@ $string['allowedipsempty'] = 'When the allowed IPs list is empty we will not blo
 $string['allowedipshasmyip'] = 'Your IP (<i>{$a->ip}</i>) is in the list and you will not be blocked out during an Outage.';
 $string['allowedipshasntmyip'] = 'Your IP (<i>{$a->ip}</i>) is not in the list and you will be blocked out during an outage.';
 $string['allowedipsnoconfig'] = 'Your config.php does not have the extra setup to allow blocking via IP.<br />Please refer to our <a href="https://github.com/catalyst/moodle-auth_outage#installation" target="_blank">README.md</a> file for more information.';
+$string['logformaintmodeconfig'] = 'Update maintenance mode configuration.';
+$string['logformaintmodeconfigcomplete'] = 'Updating maintenance mode configuration complete.';
 $string['menusettings'] = 'Settings';
 $string['menumanage'] = 'Manage outages';
 $string['messageoutagebackonline'] = 'We are back online!';
diff --git a/version.php b/version.php
index 3482760..dd71866 100644
--- a/version.php
+++ b/version.php
@@ -28,8 +28,8 @@
 defined('MOODLE_INTERNAL') || die();
 
 $plugin->component = "auth_outage";
-$plugin->version = 2022051200;                  // The current plugin version (Date: YYYYMMDDXX).
-$plugin->release = 2022051200;                  // Human-readable release information.
+$plugin->version = 2022121900;                  // The current plugin version (Date: YYYYMMDDXX).
+$plugin->release = 2022121900;                  // Human-readable release information.
 $plugin->requires = 2017111309;                 // 2017111309 = T13, but this really requires 3.9 and higher.
 $plugin->maturity = MATURITY_STABLE;            // Suitable for PRODUCTION environments!
 $plugin->supported = [39, 311];                 // A range of branch numbers of supported moodle versions.