diff --git a/lib/services/s3.js b/lib/services/s3.js
index e27aa112b4..cccd7d0713 100644
--- a/lib/services/s3.js
+++ b/lib/services/s3.js
@@ -38,7 +38,7 @@ AWS.util.update(AWS.S3.prototype, {
       1) User defined version specified:
         a) always return user defined version
       2) No user defined version specified:
-        a) default to lowest version the region supports
+        a) If not using presigned urls, default to V4
         b) If using presigned urls, default to lowest version the region supports
     */
     if (userDefinedVersion) {