diff --git a/src/Dialog.php b/src/Dialog.php
index ba867f9..11562bd 100644
--- a/src/Dialog.php
+++ b/src/Dialog.php
@@ -243,7 +243,8 @@ public function __serialize(): array
         ];
     }
 
-    public function getDialogKey(): string
+    /** @internal This method is a subject for changes in further releases < 1.0 */
+    final public function getDialogKey(): string
     {
         return implode('-', [$this->getUserId(), $this->getChatId()]);
     }
diff --git a/src/DialogManager.php b/src/DialogManager.php
index c5dd225..1bff5d4 100644
--- a/src/DialogManager.php
+++ b/src/DialogManager.php
@@ -92,6 +92,7 @@ private function readDialogState($key): Dialog
         return $this->store->get($key);
     }
 
+    /** @internal This method is a subject for changes in further releases < 1.0 */
     private function generateDialogKey(Update $update): string
     {
         return implode('-', [$update->getMessage()->from->id,  $update->getChat()->id]);