diff --git a/docs/openapi/components.yml b/docs/openapi/components.yml
new file mode 100644
index 0000000..bc3a63a
--- /dev/null
+++ b/docs/openapi/components.yml
@@ -0,0 +1,59 @@
+components:
+  schemas:
+    ErrorMessage:
+      type: object
+      title: Error
+      properties:
+        status:
+          type: string
+        message:
+          type: string
+        details:
+          type: string
+
+  responses:
+    NotFound:
+      description: The specified resource was not found
+      content:
+        application/json:
+          schema:
+            $ref: '#/components/schemas/ErrorMessage'
+    Unauthorized:
+      description: Unauthorized
+      content:
+        application/json:
+          schema:
+            $ref: '#/components/schemas/ErrorMessage'
+    Forbidden:
+      description: Forbidden
+      content:
+        application/json:
+          schema:
+            $ref: '#/components/schemas/ErrorMessage'
+    BadRequest:
+      description: Bad Request
+      content:
+        application/json:
+          schema:
+            $ref: '#/components/schemas/ErrorMessage'
+    Conflict:
+      description: Conflict
+      content:
+        application/json:
+          schema:
+            $ref: '#/components/schemas/ErrorMessage'
+    Ok:
+      description: OK
+      content:
+        application/json:
+          schema:
+            type: object
+    Created:
+      description: Created
+      content:
+        text/plain:
+          schema:
+            type: string
+    NoContent:
+      description: No Content
+      content: {}
diff --git a/docs/openapi/openapi.yml b/docs/openapi/openapi.yml
new file mode 100644
index 0000000..0fe9d78
--- /dev/null
+++ b/docs/openapi/openapi.yml
@@ -0,0 +1,44 @@
+#  ============LICENSE_START=======================================================
+#  Modification (C) 2021 Nordix Foundation
+#  ================================================================================
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#        http://www.apache.org/licenses/LICENSE-2.0
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+#
+#  SPDX-License-Identifier: Apache-2.0
+#  ============LICENSE_END=========================================================
+
+openapi: 3.0.1
+info:
+  title: NCMP DMI Plugin
+  description: Adds Data Model Inventory Registry capability for ONAP
+  version: "1.0.0"
+servers:
+  - url: //localhost:8088/
+tags:
+  - name: dmi-rest
+    description: DMI Rest
+paths:
+  /v1/helloworld:
+    get:
+      description: Hello World
+      tags:
+        - dmi-plugin
+      summary: Hello World
+      operationId: helloWorld
+      responses:
+        '200':
+          $ref: 'components.yml#/components/responses/Ok'
+        '400':
+          $ref: 'components.yml#/components/responses/BadRequest'
+        '401':
+          $ref: 'components.yml#/components/responses/Unauthorized'
+        '403':
+          $ref: 'components.yml#/components/responses/Forbidden'
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