Caveat: Any TLS/SSL I/O function can lead to either of
B<SSL_ERROR_WANT_READ> and B<SSL_ERROR_WANT_WRITE>. In particular,
SSL_read() may want to write data and SSL_write() may want to read
-data. This is because TLS/SSL handshakes may occur at any time
+data. This is mainly because TLS/SSL handshakes may occur at any time
during the protocol (initiated by either the client or the server);
SSL_read() and SSL_write() will handle any pending handshakes.