diff --git a/api-ref/source/containers.inc b/api-ref/source/containers.inc
index f785fba45..84ca6ba89 100644
--- a/api-ref/source/containers.inc
+++ b/api-ref/source/containers.inc
@@ -8,7 +8,8 @@ Lists, creates, shows details for, stats, updates, deletes, starts, resizes,
 stops, pauses, unpauses, restarts, renames, commits, kills, attaches to containers,
 gets archive from container, puts archive to container, and adds security group
 for specified container, executes command in a running container, gets logs
-of a container, displays the running processes in a container.
+of a container, displays the running processes in a container, resizes
+the tty session used by the exec.
 
 Create new container
 ====================
@@ -1048,6 +1049,51 @@ Response Example
    :language: javascript
 
 
+Resize tty when execute command in a container
+==============================================
+
+.. rest_method:: POST /v1/containers/{container_ident}/execute_resize?h={height}&&exec_id={exec_id}&w={width}
+
+Resize tty when execute command in a container.
+
+Response Codes
+--------------
+
+.. rest_status_code:: success status.yaml
+
+   - 200
+
+.. rest_status_code:: error status.yaml
+
+   - 400
+   - 401
+   - 403
+   - 404
+
+Request
+-------
+
+.. rest_parameters:: parameters.yaml
+
+   - container_ident: container_ident
+   - height: height
+   - exec_id: exec_resize_id
+   - width: width
+
+Response
+--------
+
+.. rest_parameters:: parameters.yaml
+
+  - exec_resize_output: exec_resize_output
+
+Response Example
+----------------
+
+.. literalinclude:: samples/container-execute-resize-resp.json
+   :language: javascript
+
+
 Get logs of a container
 =======================
 
diff --git a/api-ref/source/parameters.yaml b/api-ref/source/parameters.yaml
index 6646b529f..2961b7706 100644
--- a/api-ref/source/parameters.yaml
+++ b/api-ref/source/parameters.yaml
@@ -35,6 +35,12 @@ exec_interactive:
   in: query
   required: false
   type: boolean
+exec_resize_id:
+  description: |
+    The ID of the exec instance.
+  in: query
+  required: true
+  type: string
 exec_run:
   description: |
     Whether to run the command or not. If this parameter is set to true,
@@ -249,6 +255,11 @@ exec_output:
     The output of the command executed in a container.
   in: body
   type: dict
+exec_resize_output:
+  description: |
+    The output of exec_resize, including exec_id and websocket url.
+  in: body
+  type: array
 exec_url:
   description: |
     The URL to start an exec instance.
diff --git a/api-ref/source/samples/container-execute-resize-resp.json b/api-ref/source/samples/container-execute-resize-resp.json
new file mode 100644
index 000000000..98ef36375
--- /dev/null
+++ b/api-ref/source/samples/container-execute-resize-resp.json
@@ -0,0 +1,4 @@
+{
+    "exec_id": "c75e81815181bb22558306fffcaa7d049f4a79378ea70802ee6c4334d0597860",
+    "url": "ws://0.0.0.0:6784/?token=062411f1-7995-413b-988f-ba8f6c553c6c&uuid=b7074d3a-14e4-4d5a-95cc-579fef16e033"
+}