diff --git a/context/v0.1/index.json b/context/v0.1/index.json
index 46403aa..5c4a906 100644
--- a/context/v0.1/index.json
+++ b/context/v0.1/index.json
@@ -4,6 +4,10 @@
         "@protected": true,
         "id": "@id",
         "type": "@type",
+        "name": "http://schema.org/name",
+        "description": "http://schema.org/description",
+        "identifier": "http://schema.org/identifier",
+        "image": {"@id": "http://schema.org/image", "@type": "@id"},
         "EmploymentCredential": {
             "@id": "https://danubetech.github.io/employment-vocab/#EmploymentCredential",
             "@context": {
@@ -12,7 +16,9 @@
                 "id": "@id",
                 "type": "@type",
                 "name": "https://schema.org/name",
-                "description": "https://schema.org/description"
+                "description": "https://schema.org/description",
+                "identifier": "http://schema.org/identifier",
+                "image": {"@id": "http://schema.org/image", "@type": "@id"}
             }
         },
         "Employee": {