diff --git a/src/ddo/AdditionalInformation.ts b/src/ddo/AdditionalInformation.ts
index f1212ce..54d2111 100644
--- a/src/ddo/AdditionalInformation.ts
+++ b/src/ddo/AdditionalInformation.ts
@@ -12,4 +12,5 @@ export default class AdditionalInformation {
             mediaType: "text/turtle",
         }as StructuredMarkup,
     ]
+    public checksum: string
 }