diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3ea63def..bd14c539 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased][]
 
 ### Added
+- The landing page returns the conformance classes in a property `conformsTo`, which mirrors `GET /conformances` from OGC APIs.
 
 ### Changed
 - Updated to STAC specification version 1.0.0-beta.2
diff --git a/core/commons.yaml b/core/commons.yaml
index 0dab0bc1..e640aec8 100644
--- a/core/commons.yaml
+++ b/core/commons.yaml
@@ -23,6 +23,20 @@ components:
           type: string
         description:
           type: string
+    conformanceClasses:
+      type: object
+      required:
+        - conformsTo
+      properties:
+        conformsTo:
+          description: >-
+            A list of all conformance classes implemented by the server.
+            In addition to the STAC-specific conformance classes, all OGC-related
+            conformance classes listed at `GET /conformances` must be listed here.
+            This entry should mirror what `GET /conformances` returns, if implemented.
+          type: array
+          items:
+            type: string
     catalog:
       type: object
       required:
diff --git a/core/openapi.yaml b/core/openapi.yaml
index b94cad17..d340eee7 100644
--- a/core/openapi.yaml
+++ b/core/openapi.yaml
@@ -49,7 +49,9 @@ components:
       content:
         application/json:
           schema:
-            $ref: 'commons.yaml#/components/schemas/catalog'
+            allOf:
+             - $ref: 'commons.yaml#/components/schemas/catalog'
+             - $ref: 'commons.yaml#/components/schemas/conformanceClasses'
           example:
             stac_version: 1.0.0-beta.1
             id: sentinel
diff --git a/ogcapi-features/openapi.yaml b/ogcapi-features/openapi.yaml
index a4c90bdc..eae7ac3d 100644
--- a/ogcapi-features/openapi.yaml
+++ b/ogcapi-features/openapi.yaml
@@ -276,15 +276,6 @@ components:
           type: array
           items:
             $ref: '../core/commons.yaml#/components/schemas/collection'
-    confClasses:
-      type: object
-      required:
-        - conformsTo
-      properties:
-        conformsTo:
-          type: array
-          items:
-            type: string
     featureCollectionGeoJSON:
       allOf:
         - $ref: '../core/commons.yaml#/components/schemas/featureCollectionGeoJSON'
@@ -340,7 +331,7 @@ components:
       content:
         application/json:
           schema:
-            $ref: '#/components/schemas/confClasses'
+            $ref: '../core/commons.yaml#/components/schemas/conformanceClasses'
           example:
             conformsTo:
               - 'http://www.opengis.net/spec/ogcapi-features-1/1.0/conf/core'