diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index 22adfc5..96a9aab 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -4870,7 +4870,8 @@
          *   ProtocolVersion version;
          *   uint16 epoch;
          *   uint48 sequence_number;
-         *   opaque cid[cid_length];               // New field
+         *   opaque cid[cid_length]; // Additional field compared to
+         *                           // default DTLS record format
          *   uint16 length;
          *   opaque enc_content[DTLSCiphertext.length];
          * } DTLSCiphertext;