diff --git a/api-ref/source/v2/parameters.yaml b/api-ref/source/v2/parameters.yaml
index 70448f7cb..997fcf465 100644
--- a/api-ref/source/v2/parameters.yaml
+++ b/api-ref/source/v2/parameters.yaml
@@ -4183,6 +4183,18 @@ router-routes-request:
   in: body
   required: false
   type: array
+router-service_type_id:
+  description: |
+    The ID of the service type associated with the router.
+  in: body
+  required: true
+  type: string
+router-service_type_id-request:
+  description: |
+    The ID of the service type associated with the router.
+  in: body
+  required: false
+  type: string
 router-status:
   description: |
     The router status.
diff --git a/api-ref/source/v2/routers.inc b/api-ref/source/v2/routers.inc
index fa47f988d..4f6077d3a 100644
--- a/api-ref/source/v2/routers.inc
+++ b/api-ref/source/v2/routers.inc
@@ -31,6 +31,14 @@ and ``availability_zone_hints`` attributes to ``routers``, allowing scheduling
 based on availability zones and hints.
 This extension requires ``router`` and ``availability_zone`` extensions.
 
+Router service type extension (``router-service-type``)
+=======================================================
+
+The ``router-service-type`` extension enables associating a service type with a
+router by introducing the ``service_type_id`` parameter that can be
+used to associate the router with an existing ``service-provider``,
+see `Service providers`_.
+
 List routers
 ============
 
@@ -95,6 +103,7 @@ Response Parameters
    - ha: router-ha
    - availability_zone_hints: router-availability_zone_hints
    - availability_zones: router-availability_zones
+   - service_type_id: router-service_type_id
 
 Response Example
 ----------------
@@ -141,6 +150,7 @@ Request
    - distributed: router-distributed-request
    - ha: router-ha-request
    - availability_zone_hints: router-availability_zone_hints-request
+   - service_type_id: router-service_type_id-request
 
 Request Example
 ---------------
@@ -173,6 +183,7 @@ Response Parameters
    - ha: router-ha
    - availability_zone_hints: router-availability_zone_hints
    - availability_zones: router-availability_zones
+   - service_type_id: router-service_type_id
 
 Response Example
 ----------------
@@ -230,6 +241,7 @@ Response Parameters
    - ha: router-ha
    - availability_zone_hints: router-availability_zone_hints
    - availability_zones: router-availability_zones
+   - service_type_id: router-service_type_id
 
 Response Example
 ----------------
@@ -299,6 +311,7 @@ Response Parameters
    - ha: router-ha
    - availability_zone_hints: router-availability_zone_hints
    - availability_zones: router-availability_zones
+   - service_type_id: router-service_type_id
 
 Response Example
 ----------------
diff --git a/api-ref/source/v2/samples/routers/router-create-response.json b/api-ref/source/v2/samples/routers/router-create-response.json
index 18ae8041c..2d4179244 100644
--- a/api-ref/source/v2/samples/routers/router-create-response.json
+++ b/api-ref/source/v2/samples/routers/router-create-response.json
@@ -24,6 +24,7 @@
         "revision_number": 1,
         "status": "ACTIVE",
         "project_id": "0bd18306d801447bb457a46252d82d13",
-        "tenant_id": "0bd18306d801447bb457a46252d82d13"
+        "tenant_id": "0bd18306d801447bb457a46252d82d13",
+        "service_type_id": null
     }
 }
diff --git a/api-ref/source/v2/samples/routers/router-show-response.json b/api-ref/source/v2/samples/routers/router-show-response.json
index e4519ee14..20b88f23f 100644
--- a/api-ref/source/v2/samples/routers/router-show-response.json
+++ b/api-ref/source/v2/samples/routers/router-show-response.json
@@ -33,6 +33,7 @@
         ],
         "status": "ACTIVE",
         "project_id": "0bd18306d801447bb457a46252d82d13",
-        "tenant_id": "0bd18306d801447bb457a46252d82d13"
+        "tenant_id": "0bd18306d801447bb457a46252d82d13",
+        "service_type_id": null
     }
 }
diff --git a/api-ref/source/v2/samples/routers/router-update-response.json b/api-ref/source/v2/samples/routers/router-update-response.json
index 972ed2337..6e806f3b8 100644
--- a/api-ref/source/v2/samples/routers/router-update-response.json
+++ b/api-ref/source/v2/samples/routers/router-update-response.json
@@ -29,6 +29,7 @@
         ],
         "status": "ACTIVE",
         "project_id": "0bd18306d801447bb457a46252d82d13",
-        "tenant_id": "0bd18306d801447bb457a46252d82d13"
+        "tenant_id": "0bd18306d801447bb457a46252d82d13",
+        "service_type_id": null
     }
 }
diff --git a/api-ref/source/v2/samples/routers/routers-list-response.json b/api-ref/source/v2/samples/routers/routers-list-response.json
index 7e50eac9b..f16cf6190 100644
--- a/api-ref/source/v2/samples/routers/routers-list-response.json
+++ b/api-ref/source/v2/samples/routers/routers-list-response.json
@@ -34,7 +34,8 @@
             ],
             "status": "ACTIVE",
             "project_id": "0bd18306d801447bb457a46252d82d13",
-            "tenant_id": "0bd18306d801447bb457a46252d82d13"
+            "tenant_id": "0bd18306d801447bb457a46252d82d13",
+            "service_type_id": null
         },
         {
             "admin_state_up": true,
@@ -65,7 +66,8 @@
             "routes": [],
             "status": "ACTIVE",
             "project_id": "0bd18306d801447bb457a46252d82d13",
-            "tenant_id": "0bd18306d801447bb457a46252d82d13"
+            "tenant_id": "0bd18306d801447bb457a46252d82d13",
+            "service_type_id": null
         }
     ]
 }