diff --git a/src/Asset.ts b/src/Asset.ts
index 610c522c..81e56862 100644
--- a/src/Asset.ts
+++ b/src/Asset.ts
@@ -18,6 +18,7 @@ export default class Asset {
     public dataFormat?: DataFormat;
     public dependencies: Asset[];
     public clean?: boolean;
+    public provenance?: AssetId;
 
     /**
      * Construct an Asset.
@@ -46,6 +47,10 @@ export default class Asset {
         this.dependencies = [];
     }
 
+    setProvenance(id: AssetId | undefined) {
+        this.provenance = id;
+    }
+
     setData (data: AssetData | undefined, dataFormat: DataFormat | undefined, generateId?: boolean) {
         if (data && !dataFormat) {
             throw new Error('Data provided without specifying its format');
diff --git a/src/ScratchStorage.ts b/src/ScratchStorage.ts
index 4d51ffbd..03780db8 100644
--- a/src/ScratchStorage.ts
+++ b/src/ScratchStorage.ts
@@ -14,6 +14,13 @@ interface HelperWithPriority {
     priority: number
 }
 
+export interface StoreMetadata {
+    /**
+     * The assetId of the asset that the currently uploaded one is based on.
+     */
+    provenance?: AssetId;
+}
+
 export class ScratchStorage {
     public defaultAssetId: Record<AssetType['name'], AssetId>;
     public builtinHelper: BuiltinHelper;
@@ -246,10 +253,11 @@ export class ScratchStorage {
      * @param {AssetType} assetType - The type of asset to fetch. This also determines which asset store to use.
      * @param {?DataFormat} [dataFormat] - Optional: load this format instead of the AssetType's default.
      * @param {Buffer} data - Data to store for the asset
-     * @param {?string} [assetId] - The ID of the asset to fetch: a project ID, MD5, etc.
+     * @param {?string} [assetId] - The ID of the asset to store: a project ID, MD5, etc.
+     * @param {?object} [_storeMetadata] - Optional: metadata for the save operation
      * @return {Promise.<object>} A promise for asset metadata
      */
-    store (assetType: AssetType, dataFormat: DataFormat | null | undefined, data: AssetData, assetId?: AssetId) {
+    store (assetType: AssetType, dataFormat: DataFormat | null | undefined, data: AssetData, assetId?: AssetId, _storeMetadata?: StoreMetadata) {
         dataFormat = dataFormat || assetType.runtimeFormat;
 
         return this.webHelper.store(assetType, dataFormat, data, assetId)
diff --git a/src/index.ts b/src/index.ts
index 37a8830b..f6892e73 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,4 +1,4 @@
-import {ScratchStorage} from './ScratchStorage';
+import {ScratchStorage, StoreMetadata} from './ScratchStorage';
 import Asset, {AssetId} from './Asset';
 import {AssetType} from './AssetType';
 import {DataFormat} from './DataFormat';
@@ -15,5 +15,6 @@ export {
     AssetId,
     AssetType,
     DataFormat,
-    Helper
+    Helper,
+    StoreMetadata
 };