diff --git a/CHANGELOG.md b/CHANGELOG.md
index d5a6d800..15ec44b6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -17,6 +17,8 @@ For a roadmap including expected timeline, please refer to [ROADMAP.md](./ROADMA
 ### Added
 
 - Added missing property `$id` to annotation extension schemas
+- ADDED: Added `@ORD` annotation vocabulary
+  - Added `@ORD.ordIds` to correlate CSN Service and Entity to its ORD API Resource, Event Resource and Entity Type equivalents.
 - Added clarification that `key: true` also implies `notNull: true`
 
 ## [1.0.3]
diff --git a/spec-toolkit.config.json b/spec-toolkit.config.json
index e8943d8b..ce171864 100644
--- a/spec-toolkit.config.json
+++ b/spec-toolkit.config.json
@@ -102,6 +102,19 @@
         "description": "@ODM for One Domain Model (ODM) related annotations."
       }
     },
+    {
+      "type": "specExtension",
+      "id": "ord",
+      "sourceFilePath": "./spec/v1/annotations/ord.yaml",
+      "sourceIntroFilePath": "./spec/v1/annotations/ord.md",
+      "targetDocumentId": "csn-interop-effective",
+      "targetLink": "../spec-v1/csn-interop-effective",
+      "mdFrontmatter": {
+        "title": "@ORD",
+        "sidebar_position": 9,
+        "description": "@ORD for Open Resource Discovery related annotations."
+      }
+    },
     {
       "type": "specExtension",
       "id": "personal-data",
@@ -110,7 +123,7 @@
       "targetDocumentId": "csn-interop-effective",
       "mdFrontmatter": {
         "title": "@PersonalData",
-        "sidebar_position": 9,
+        "sidebar_position": 10,
         "description": "@PersonalData to annotate DPP relevant information."
       }
     },
@@ -122,7 +135,7 @@
       "targetDocumentId": "csn-interop-effective",
       "mdFrontmatter": {
         "title": "@Semantics",
-        "sidebar_position": 10,
+        "sidebar_position": 11,
         "description": "@Semantics annotations."
       }
     }
diff --git a/spec/v1/annotations/ord.md b/spec/v1/annotations/ord.md
new file mode 100644
index 00000000..ccb89457
--- /dev/null
+++ b/spec/v1/annotations/ord.md
@@ -0,0 +1,14 @@
+> <span className="feature-status-beta">BETA</span> This annotation is beta and should be reviewed for completion and correctness.
+
+## Introduction
+
+[Open Resource Discovery](https://sap.github.io/open-resource-discovery/) (ORD) is a complementary standard to CSN Interop.
+It's purpose is to provide a decentralized protocol for metadata publishing and discovery of applications and services.
+From ORD perspective, CSN Interop is a possible resource definition format that can be attached to API and Event resources.
+
+On the ORD level, more high-level context can be found and expressed, that is shared across different protocols and standards.
+Also it covers (global) taxonomy and relationships between high-level concepts.
+
+With this annotations it's possible to connect the CSN Interop concepts back to the high-level ORD concepts.
+
+> 🔗 Visit the public [Open Resource Discovery](https://sap.github.io/open-resource-discovery/) page.
diff --git a/spec/v1/annotations/ord.yaml b/spec/v1/annotations/ord.yaml
new file mode 100644
index 00000000..b5988c67
--- /dev/null
+++ b/spec/v1/annotations/ord.yaml
@@ -0,0 +1,20 @@
+$schema: "http://json-schema.org/draft-07/schema#"
+title: "ORD"
+x-extension:
+  targetDocument: "./spec/v1/CSN-Interop-Effective.schema.yaml"
+  targetLink: "../spec-v1/csn-interop-effective"
+
+definitions:
+  "@ORD.ordIds":
+    type: array
+    items:
+      type: string
+      pattern: ^([a-z0-9-]+(?:[.][a-z0-9-]+)*):(apiResource|eventResource|entityType):([a-zA-Z0-9._\-]+):(v0|v[1-9][0-9]*|)$
+    description: |-
+      The [ORD ID](https://sap.github.io/open-resource-discovery/spec-v1#ord-id) of the CSN definition.
+      It can be an array, because a single CDS [Service](../spec-v1/csn-interop-effective#i18n) can be exposed via multiple concrete API or Event protocols.
+    examples:
+      - ["sap.s4:apiResource:API_BILL_OF_MATERIAL_SRV:v1"]
+    x-extension-targets:
+      - "Entity"
+      - "Service"
diff --git a/spec/v1/examples/airline.json b/spec/v1/examples/airline.json
index 34c180a3..6720affd 100644
--- a/spec/v1/examples/airline.json
+++ b/spec/v1/examples/airline.json
@@ -15,7 +15,8 @@
   "definitions": {
     "AirlineService": {
       "kind": "service",
-      "doc": "This is describing the service that exposes the CDS entities through an API."
+      "doc": "This is describing the service that exposes the CDS entities through an API.",
+      "@ORD.ordIds": ["sap.foo:apiResource:AirlineDeltaShare:v1"]
     },
     "AirlineService.Airline": {
       "kind": "entity",
@@ -24,6 +25,7 @@
       "@ObjectModel.modelingPattern": {
         "#": "ANALYTICAL_DIMENSION"
       },
+      "@ORD.ordIds": ["sap.foo:entityType:Airline:v1"],
       "elements": {
         "AirlineID": {
           "@EndUserText.label": "Airline",