diff --git a/types/rdfjs__express-handler/index.d.ts b/types/rdfjs__express-handler/index.d.ts
index c48823caa7..38038ad6e6 100644
--- a/types/rdfjs__express-handler/index.d.ts
+++ b/types/rdfjs__express-handler/index.d.ts
@@ -1,4 +1,4 @@
-// Type definitions for @rdfjs/express-handler 1.0
+// Type definitions for @rdfjs/express-handler 1.1
 // Project: https://github.com/rdfjs-base/express-handler
 // Definitions by: tpluscode <https://github.com/tpluscode>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
@@ -19,10 +19,15 @@ declare module 'express' {
     }
 }
 
+interface BaseIriFromRequest {
+    (req: Request): Promise<string> | string;
+}
+
 interface RdfHandlerOptions {
     factory?: DatasetCoreFactory;
     formats?: typeof formats;
     defaultMediaType?: string;
+    baseIriFromRequest?: boolean | BaseIriFromRequest;
 }
 
 interface RdfHandler {
diff --git a/types/rdfjs__express-handler/rdfjs__express-handler-tests.ts b/types/rdfjs__express-handler/rdfjs__express-handler-tests.ts
index 75ca2ace4b..ffab130a03 100644
--- a/types/rdfjs__express-handler/rdfjs__express-handler-tests.ts
+++ b/types/rdfjs__express-handler/rdfjs__express-handler-tests.ts
@@ -16,7 +16,19 @@ app.use(rdfHandler());
 app.use(rdfHandler({
     factory,
     formats,
-    defaultMediaType: 'text/turtle'
+    defaultMediaType: 'text/turtle',
+}));
+
+app.use(rdfHandler({
+    baseIriFromRequest: true,
+}));
+
+app.use(rdfHandler({
+    baseIriFromRequest: (req: express.Request) => req.path,
+}));
+
+app.use(rdfHandler({
+    baseIriFromRequest: (req: express.Request) => Promise.resolve(req.path),
 }));
 
 async function streams(req: express.Request, res: express.Response) {