diff --git a/lib/api-route-provider.js b/lib/api-route-provider.js
index 52a19af..948c18b 100644
--- a/lib/api-route-provider.js
+++ b/lib/api-route-provider.js
@@ -69,6 +69,9 @@ var _default = function _default(app) {
           return res.json(route.response);
         }
         var firstResponse = callIfFunc(responses[0] || {});
+        if (route.filename) {
+          res.set('X-headlamp-server-file', route.filename);
+        }
         return res.status(firstResponse.status || 500).json(firstResponse.response || 'No response defined.');
       });
     });
diff --git a/package.json b/package.json
index 66c38a6..2ee9c17 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "headlamp",
-  "version": "0.2.3",
+  "version": "0.3.0",
   "description": "Express API documenter",
   "main": "lib/index.js",
   "scripts": {
diff --git a/src/api-route-provider.js b/src/api-route-provider.js
index b23160a..57dfb8e 100644
--- a/src/api-route-provider.js
+++ b/src/api-route-provider.js
@@ -32,6 +32,9 @@ export default function (app, options = {}) {
           return res.json(route.response)
         }
         const firstResponse = callIfFunc(responses[0] || {})
+        if (route.filename) {
+          res.set('X-headlamp-server-file', route.filename)
+        }
         return res
           .status(firstResponse.status || 500)
           .json(firstResponse.response || 'No response defined.')