diff --git a/Amazon-IAM-API.md b/Amazon-IAM-API.md
index ed7e44c..2e26e5c 100644
--- a/Amazon-IAM-API.md
+++ b/Amazon-IAM-API.md
@@ -16,4 +16,11 @@ To be compatible with Amazon IAM API, a separate "weed iam" command is provided.
 * GetUser
 * ListUsers
 * ListAccessKeys
+```
+
+# Authentication
+
+By default, the access key and secret key to access weed iam is not authenticated. To enable credential based access, create an admin credentials to the example below
+```
+echo 's3.configure -access_key some_access_key1 -secret_key some_secret_key1 -user iam -actions Admin -apply' | weed shell
 ```
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