diff --git a/releasenotes/notes/network-device-mtu-default-90faa7d685d4d0ec.yaml b/releasenotes/notes/network-device-mtu-default-90faa7d685d4d0ec.yaml
new file mode 100644
index 000000000..17304e3e7
--- /dev/null
+++ b/releasenotes/notes/network-device-mtu-default-90faa7d685d4d0ec.yaml
@@ -0,0 +1,7 @@
+---
+upgrade:
+  - |
+    In order to match the default value of MTU defined
+    in Neutron, regardless of the SDN used, the default
+    value ``[neutron_defaults]network_device_mtu`` is now
+    set to 0.