diff --git a/userdocs/fuel-install-guide/sysreq/sysreq_fuel_master_node_network_reqs.rst b/userdocs/fuel-install-guide/sysreq/sysreq_fuel_master_node_network_reqs.rst
index fc38417c7..9ea72063b 100644
--- a/userdocs/fuel-install-guide/sysreq/sysreq_fuel_master_node_network_reqs.rst
+++ b/userdocs/fuel-install-guide/sysreq/sysreq_fuel_master_node_network_reqs.rst
@@ -16,6 +16,9 @@ the Internet. In this case, set up a local repository with the required
 installation packages and configure these repositories on the Fuel Master
 node.
 
+.. warning:: You can run only one Fuel Master node in a network set or the
+             product will behave unexpectedly.
+
 .. seealso::
 
     - :ref:`upgrade_local_repo`