diff --git a/packages/jspsych/src/ExtensionManager.ts b/packages/jspsych/src/ExtensionManager.ts
index 02ce60d2fc..75802759d2 100644
--- a/packages/jspsych/src/ExtensionManager.ts
+++ b/packages/jspsych/src/ExtensionManager.ts
@@ -67,6 +67,15 @@ export class ExtensionManager {
       )
     );
 
+    const extensionInfo = trialExtensionsConfiguration.length
+      ? {
+          extension_type: results.map((result) => result.extension_type),
+          extension_version: results.map((result) => result.extension_version),
+        }
+      : {};
+
+    results.push(extensionInfo);
+
     return Object.assign({}, ...results);
   }
 }