doc update

diff --git a/lib/gnutls_dtls.c b/lib/gnutls_dtls.c
index d1d6953c9d8954480530b05199a397e878b236b2..8717c69b36a8aa7d9c4bbfb9eaa5ef62edbad4df 100644 (file)
--- a/lib/gnutls_dtls.c
+++ b/lib/gnutls_dtls.c
@@ -685,6 +685,9 @@ int overhead;
  * renegotiation, in order to ensure that the MTU is still sufficient to
  * account for the new protocol overhead.
  *
+ * In most cases you only need to call gnutls_dtls_set_mtu() with
+ * the maximum MTU of your transport layer.
+ *
  * Returns: %GNUTLS_E_SUCCESS (0) on success, or a negative error code.
  *
  * Since: 3.1