diff --git a/src/Target.php b/src/Target.php
index 89d82d8..51f0fc5 100644
--- a/src/Target.php
+++ b/src/Target.php
@@ -12,6 +12,7 @@
 use sergeymakinen\yii\logmessage\Message;
 use yii\base\InvalidValueException;
 use yii\di\Instance;
+use yii\helpers\StringHelper;
 use yii\httpclient\Client;
 use yii\log\Logger;
 
@@ -71,6 +72,11 @@ class Target extends \yii\log\Target
         Logger::LEVEL_TRACE => '📝',
     ];
 
+    /**
+     * @var int max character in message text.
+     */
+    public $substitutionMaxLength = 3000;
+
     /**
      * @inheritDoc
      */
@@ -231,6 +237,7 @@ private function substitute($name, Message $message)
         }
 
         if ($config['wrapAsCode']) {
+            $value = StringHelper::truncate($value, $this->substitutionMaxLength);
             if ($config['short']) {
                 $value = '`' . $value . '`';
             } else {