diff --git a/master/sdo_request.c b/master/sdo_request.c
index 6fefaa7a..840a0a44 100644
--- a/master/sdo_request.c
+++ b/master/sdo_request.c
@@ -200,10 +200,14 @@ void ecrt_sdo_request_write(ec_sdo_request_t *req)
 
 /*****************************************************************************/
 
+/** \cond */
+
 EXPORT_SYMBOL(ecrt_sdo_request_timeout);
 EXPORT_SYMBOL(ecrt_sdo_request_data);
 EXPORT_SYMBOL(ecrt_sdo_request_state);
 EXPORT_SYMBOL(ecrt_sdo_request_read);
 EXPORT_SYMBOL(ecrt_sdo_request_write);
 
+/** \endcond */
+
 /*****************************************************************************/