diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8f54b078..234f109d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,7 @@
 * Add `enabled` option to `handlers` configuration
 * Add `priority` field to `processor` tag
 * Add `mongodb` handler and deprecate `mongo`
+* Add `monolog.formatter.syslog` service definition to format RFC5424-compliant messages
 
 ## 3.10.0 (2023-11-06)
 
diff --git a/config/monolog.php b/config/monolog.php
index 2621fff3..073dba0f 100644
--- a/config/monolog.php
+++ b/config/monolog.php
@@ -20,6 +20,7 @@
 use Monolog\Formatter\LogstashFormatter;
 use Monolog\Formatter\NormalizerFormatter;
 use Monolog\Formatter\ScalarFormatter;
+use Monolog\Formatter\SyslogFormatter;
 use Monolog\Formatter\WildfireFormatter;
 use Monolog\Handler\FingersCrossed\ErrorLevelActivationStrategy;
 use Monolog\Logger;
@@ -55,6 +56,7 @@
         ->set('monolog.formatter.html', HtmlFormatter::class)
         ->set('monolog.formatter.json', JsonFormatter::class)
         ->set('monolog.formatter.line', LineFormatter::class)
+        ->set('monolog.formatter.syslog', SyslogFormatter::class)
         ->set('monolog.formatter.loggly', LogglyFormatter::class)
         ->set('monolog.formatter.normalizer', NormalizerFormatter::class)
         ->set('monolog.formatter.scalar', ScalarFormatter::class)