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-rw-r--r--doc/ssl/SSL_write.pod3
1 files changed, 3 insertions, 0 deletions
diff --git a/doc/ssl/SSL_write.pod b/doc/ssl/SSL_write.pod
index dfa42e9aee..e013c12d52 100644
--- a/doc/ssl/SSL_write.pod
+++ b/doc/ssl/SSL_write.pod
@@ -65,6 +65,9 @@ When an SSL_write() operation has to be repeated because of
B<SSL_ERROR_WANT_READ> or B<SSL_ERROR_WANT_WRITE>, it must be repeated
with the same arguments.
+When calling SSL_write() with num=0 bytes to be sent the behaviour is
+undefined.
+
=head1 RETURN VALUES
The following return values can occur: