diff --git a/src/main/webapp/definitions/alfresco-core.yaml b/src/main/webapp/definitions/alfresco-core.yaml
index 625717be..c89c4b9e 100755
--- a/src/main/webapp/definitions/alfresco-core.yaml
+++ b/src/main/webapp/definitions/alfresco-core.yaml
@@ -2940,6 +2940,33 @@ paths:
           description: Unexpected error
           schema:
             $ref: '#/definitions/Error'
+  '/nodes/{nodeId}/size':
+    get:
+      tags:
+        - nodes
+      summary: Get folder size
+      description: |
+        Get the size of a folder
+      operationId: getFolderSize
+      produces:
+        - application/json
+      parameters:
+        - $ref: '#/parameters/nodeTargetIdParam'
+      responses:
+        '200':
+          description: Successful response
+          schema:
+            $ref: '#/definitions/FolderSizeResponse'
+        '401':
+          description: Authentication failed
+        '403':
+          description: Current user does not have permission for **nodeId**
+        '404':
+          description: Entity with **nodeId** does not exist
+        default:
+          description: Unexpected error
+          schema:
+            $ref: '#/definitions/Error'
   '/nodes/{nodeId}/versions':
     get:
       x-alfresco-since: "5.2"
@@ -10690,6 +10717,13 @@ definitions:
         $ref: '#/definitions/PermissionsInfo'
       definition:
         $ref: '#/definitions/Definition'
+  FolderSizeResponse:
+    type: object
+    properties:
+      id:
+        type: string
+      size:
+        type: string
   ProbeEntry:
     type: object
     required: