And SSL_get_servername, SSL_set_tlsext_host_name, and SSL_CTX_set_tlsext_servername_callback
diff --git a/OpenSSL/ssl/context.h b/OpenSSL/ssl/context.h
index 21407f3..19b5e9e 100644
--- a/OpenSSL/ssl/context.h
+++ b/OpenSSL/ssl/context.h
@@ -29,6 +29,7 @@
                         *passphrase_userdata,
                         *verify_callback,
                         *info_callback,
+                        *tlsext_servername_callback,
                         *app_data;
     PyThreadState       *tstate;
 } ssl_ContextObj;