diff --git a/src/CL/Slack/Model/SimpleMessage.php b/src/CL/Slack/Model/SimpleMessage.php
index c06a2220..1abc190e 100644
--- a/src/CL/Slack/Model/SimpleMessage.php
+++ b/src/CL/Slack/Model/SimpleMessage.php
@@ -73,6 +73,14 @@ public function getType()
     {
         return $this->type;
     }
+    
+    /**
+     * @return null|string The subtype of message
+     */
+    public function getSubtype()
+    {
+        return $this->subtype;
+    }
 
     /**
      * @return SimpleChannel