diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index 061f9af..e0583c2 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -1330,7 +1330,8 @@
  * \def MBEDTLS_SSL_CID
  *
  * Enable support for the DTLS Connection ID extension
- * (version draft-ietf-tls-dtls-connection-id-05)
+ * (version draft-ietf-tls-dtls-connection-id-05,
+ * https://tools.ietf.org/html/draft-ietf-tls-dtls-connection-id-05)
  * which allows to identify DTLS connections across changes
  * in the underlying transport.
  *
diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index 71b9619..43caa1c 100644
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -393,7 +393,8 @@
 #define MBEDTLS_TLS_EXT_SESSION_TICKET              35
 
 /* The value of the CID extension is still TBD as of
- * https://tools.ietf.org/html/draft-ietf-tls-dtls-connection-id-04. */
+ * draft-ietf-tls-dtls-connection-id-05
+ * (https://tools.ietf.org/html/draft-ietf-tls-dtls-connection-id-05) */
 #define MBEDTLS_TLS_EXT_CID                        254 /* TBD */
 
 #define MBEDTLS_TLS_EXT_ECJPAKE_KKPP               256 /* experimental */
@@ -1540,8 +1541,8 @@
  * \brief             Configure the use of the Connection ID (CID)
  *                    extension in the next handshake.
  *
- *                    Reference:
- *                    https://tools.ietf.org/html/draft-ietf-tls-dtls-connection-id-04
+ *                    Reference: draft-ietf-tls-dtls-connection-id-05
+ *                    https://tools.ietf.org/html/draft-ietf-tls-dtls-connection-id-05
  *
  *                    The DTLS CID extension allows the reliable association of
  *                    DTLS records to DTLS connections across changes in the