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-rw-r--r--lib/record.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/record.c b/lib/record.c
index c9bf616caa..ce0ecb672a 100644
--- a/lib/record.c
+++ b/lib/record.c
@@ -1760,6 +1760,10 @@ gnutls_record_send(gnutls_session_t session, const void *data,
* To determine the maximum size of padding, use
* gnutls_record_get_max_size() and gnutls_record_overhead_size().
*
+ * Note that in order for GnuTLS to provide constant time processing
+ * of padding and data in TLS1.3, the flag %GNUTLS_SAFE_PADDING_CHECK
+ * must be used in gnutls_init().
+ *
* Returns: The number of bytes sent, or a negative error code. The
* number of bytes sent might be less than @data_size. The maximum
* number of bytes this function can send in a single call depends