diff --git a/core/commons.yaml b/core/commons.yaml
index 8b919de8..0aa2d226 100644
--- a/core/commons.yaml
+++ b/core/commons.yaml
@@ -53,6 +53,8 @@ components:
           $ref: '#/components/schemas/stac_extensions'
         type:
           type: string
+          enum:
+            - Catalog
         id:
           type: string
         title:
@@ -78,6 +80,8 @@ components:
           $ref: '#/components/schemas/stac_extensions'
         type:
           type: string
+          enum:
+            - Collection
         id:
           description: identifier of the collection used, for example, in URIs
           type: string