diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index 7f073af..8e3161c 100644
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -1337,7 +1337,7 @@
 
 /**
  * \brief           Set the transport type (TLS or DTLS).
- *                  Default: TLS
+ *                  Default: TLS if both are enabled, or DTLS.
  *
  * \note            For DTLS, you must either provide a recv callback that
  *                  doesn't block, or one that handles timeouts, see