diff --git a/message.h b/message.h
index 61d4cbcafd86a468f2282a4f0ee4931a91b10a09..1bc333c88c32ab0b8367cea2ec0631118d78daaa 100644
--- a/message.h
+++ b/message.h
@@ -33,7 +33,6 @@ THE SOFTWARE.
 #define MESSAGE_UPDATE 8
 #define MESSAGE_REQUEST 9
 #define MESSAGE_MH_REQUEST 10
-/* 11 and 12 are for authentication */
 
 /* Protocol extension through sub-TLVs. */
 #define SUBTLV_PAD1 0