diff --git a/api-ref/source/v2/networks.inc b/api-ref/source/v2/networks.inc
index e38d665f6..731b6c780 100644
--- a/api-ref/source/v2/networks.inc
+++ b/api-ref/source/v2/networks.inc
@@ -50,13 +50,17 @@ a VLAN transparecy of the network. If the service does not support VLAN
 transparency and a user requests a VLAN transparent network,
 the plug-in refuses to create one and returns an appropriate error to the user.
 
-MTU extension
-=============
+MTU extensions
+==============
 
 The ``net-mtu`` extension allows plug-ins to expose the MTU that is guaranteed
 to pass through the data path of the segments in the network. This extension
 introduces a read-only ``mtu`` attribute.
 
+A newer ``net-mtu-writable`` extension enhances ``net-mtu`` in that now the
+``mtu`` attribute is available for write (both when creating as well as
+updating networks).
+
 DNS integration
 ===============
 
@@ -159,6 +163,7 @@ Request
    - network: network
    - admin_state_up: network-admin_state_up-request
    - dns_domain: dns_domain-request
+   - mtu: mtu-request
    - name: network-name-request
    - port_security_enabled: network-port_security_enabled-request
    - provider:network_type: provider:network_type
@@ -355,6 +360,7 @@ Request
    - network: network
    - admin_state_up: network-admin_state_up-request
    - dns_domain: dns_domain-request
+   - mtu: mtu-request
    - name: network-name-request
    - port_security_enabled: network-port_security_enabled-request
    - project_id: project_id-request
@@ -458,6 +464,7 @@ Request
    - networks: networks
    - admin_state_up: network-admin_state_up-request
    - dns_domain: dns_domain-request
+   - mtu: mtu-request
    - name: network-name-request
    - port_security_enabled: network-port_security_enabled-request
    - project_id: project_id-request
diff --git a/api-ref/source/v2/samples/networks/network-create-request.json b/api-ref/source/v2/samples/networks/network-create-request.json
index 9cb5998f2..47773c6cb 100644
--- a/api-ref/source/v2/samples/networks/network-create-request.json
+++ b/api-ref/source/v2/samples/networks/network-create-request.json
@@ -3,6 +3,7 @@
         "name": "sample_network",
         "admin_state_up": true,
         "dns_domain": "my-domain.org.",
-        "qos_policy_id": "6a8454ade84346f59e8d40665f878b2e"
+        "qos_policy_id": "6a8454ade84346f59e8d40665f878b2e",
+        "mtu": 1400
     }
 }
diff --git a/api-ref/source/v2/samples/networks/network-create-response.json b/api-ref/source/v2/samples/networks/network-create-response.json
index 56169b20c..a6a59be9f 100644
--- a/api-ref/source/v2/samples/networks/network-create-response.json
+++ b/api-ref/source/v2/samples/networks/network-create-response.json
@@ -8,7 +8,7 @@
         "created_at": "2016-03-08T20:19:41",
         "dns_domain": "my-domain.org.",
         "id": "4e8e5957-649f-477b-9e5b-f1f75b21c03c",
-        "mtu": 1500,
+        "mtu": 1400,
         "name": "net1",
         "port_security_enabled": true,
         "project_id": "9bacb3c5d39d41a79512987f338cf177",
diff --git a/api-ref/source/v2/samples/networks/network-multi-create-response.json b/api-ref/source/v2/samples/networks/network-multi-create-response.json
index 5e6ba1d9b..a5430b66f 100644
--- a/api-ref/source/v2/samples/networks/network-multi-create-response.json
+++ b/api-ref/source/v2/samples/networks/network-multi-create-response.json
@@ -5,6 +5,7 @@
         "name": "net1",
         "admin_state_up": true,
         "dns_domain": "",
+        "mtu": 1500,
         "project_id": "9bacb3c5d39d41a79512987f338cf177",
         "tenant_id": "9bacb3c5d39d41a79512987f338cf177",
         "qos_policy_id": "6a8454ade84346f59e8d40665f878b2e",
diff --git a/api-ref/source/v2/samples/networks/network-update-request.json b/api-ref/source/v2/samples/networks/network-update-request.json
index 63ee48c2b..759d8f633 100644
--- a/api-ref/source/v2/samples/networks/network-update-request.json
+++ b/api-ref/source/v2/samples/networks/network-update-request.json
@@ -2,6 +2,7 @@
     "network": {
         "dns_domain": "my-domain.org.",
         "name": "sample_network_5_updated",
-        "qos_policy_id": "6a8454ade84346f59e8d40665f878b2e"
+        "qos_policy_id": "6a8454ade84346f59e8d40665f878b2e",
+        "mtu": 1300
     }
 }
diff --git a/api-ref/source/v2/samples/networks/network-update-response.json b/api-ref/source/v2/samples/networks/network-update-response.json
index cd8d6709b..42ac15373 100644
--- a/api-ref/source/v2/samples/networks/network-update-response.json
+++ b/api-ref/source/v2/samples/networks/network-update-response.json
@@ -8,7 +8,7 @@
         "created_at": "2016-03-08T20:19:41",
         "dns_domain": "my-domain.org.",
         "id": "1f370095-98f6-4079-be64-6d3d4a6adcc6",
-        "mtu": 1500,
+        "mtu": 1300,
         "name": "sample_network_5_updated",
         "port_security_enabled": true,
         "project_id": "4fd44f30292945e481c7b8a0c8908869",