diff --git a/extension/sigv4authextension/README.md b/extension/sigv4authextension/README.md
index ca78fd9ddef8..9a9b5cc37186 100644
--- a/extension/sigv4authextension/README.md
+++ b/extension/sigv4authextension/README.md
@@ -26,7 +26,7 @@ The configuration fields are as follows:
     * Note that an attempt will be made to obtain a valid region from the endpoint of the service you are exporting to
     * [List of AWS regions](https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Concepts.RegionsAndAvailabilityZones.html)
 * `service`: **Optional**. The AWS service for AWS Sigv4
-    * Note that an attempt will be made to obtain a valid service from the endpoint of the service you are exporting to
+    * Note for supported services an attempt will be made to obtain a valid service from the endpoint of the service you are exporting to. Supported services include - workspaces, es, logs and traces.
 
 
 ```yaml