diff --git a/packages/node/src/sdk/init.ts b/packages/node/src/sdk/init.ts
index c03af9ec09d5..5276b3fe6547 100644
--- a/packages/node/src/sdk/init.ts
+++ b/packages/node/src/sdk/init.ts
@@ -169,6 +169,8 @@ function _init(
     client.init();
   }
 
+  logger.log(`Running in ${isCjs() ? 'CommonJS' : 'ESM'} mode.`);
+
   if (options.autoSessionTracking) {
     startSessionTracking();
   }