doc update

diff --git a/lib/gnutls_dtls.c b/lib/gnutls_dtls.c
index 1800d6ed141c9bee46d75a22384e03465fc93618..0d2f8b6be81c53488561581c9a62c43db112daf6 100644 (file)
--- a/lib/gnutls_dtls.c
+++ b/lib/gnutls_dtls.c
@@ -642,7 +642,7 @@ int total = 0, ret, iv_size;
  *
  * This function will return the actual maximum transfer unit for
  * application data. I.e. DTLS headers are subtracted from the
- * actual MTU.
+ * actual MTU which is set using gnutls_dtls_set_mtu().
  *
  * Returns: the maximum allowed transfer unit.
  *