diff --git a/src/Socialbox/Enums/StandardMethods.php b/src/Socialbox/Enums/StandardMethods.php
index 66eb290..2bdc72f 100644
--- a/src/Socialbox/Enums/StandardMethods.php
+++ b/src/Socialbox/Enums/StandardMethods.php
@@ -79,6 +79,7 @@
 
         // Encryption Channel Methods
         case ENCRYPTION_ACCEPT_CHANNEL = 'encryptionAcceptChannel';
+        case ENCRYPTION_CHANNEL_ACKNOWLEDGE_MESSAGE = 'encryptionChannelAcknowledgeMessage';
         case ENCRYPTION_CHANNEL_EXISTS = 'encryptionChannelExists';
         case ENCRYPTION_CHANNEL_SEND = 'encryptionChannelSend';
         case ENCRYPTION_CLOSE_CHANNEL = 'encryptionCloseChannel';