diff --git a/source/davinci/base/components.d b/source/davinci/base/components.d
index 9a7f023..f135ad9 100644
--- a/source/davinci/base/components.d
+++ b/source/davinci/base/components.d
@@ -84,6 +84,15 @@ public enum CommandType
     SPACER,
     NOP_COMMAND,
 
+    /**
+     * Unknown command
+     * 
+     * Sent as a reply when
+     * an unknown command
+     * is received
+     */
+    UNKNOWN_COMMAND,
+
     /**
      * Authentication command
      *