diff --git a/README.md b/README.md
index c2ba47f6..2e2df541 100644
--- a/README.md
+++ b/README.md
@@ -151,7 +151,11 @@ Options:
   -T <CONTENT_TYPE>
           Content-Type.
   -a <BASIC_AUTH>
-          Basic authentication, username:password
+          Basic authentication (username:password), or AWS credentials (access_key:secret_key)
+      --aws-session <AWS_SESSION>
+          AWS session token
+      --aws-sigv4 <AWS_SIGV4>
+          AWS SigV4 signing params (format: aws:amz:region:service)
   -x <PROXY>
           HTTP proxy
       --proxy-http-version <PROXY_HTTP_VERSION>
diff --git a/src/main.rs b/src/main.rs
index 571ef6c2..cb4353f7 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -154,7 +154,7 @@ Note: If qps is specified, burst will be ignored",
     #[arg(help = "Content-Type.", short = 'T')]
     content_type: Option<String>,
     #[arg(
-        help = "Basic authentication or AWS credentials, username:password",
+        help = "Basic authentication (username:password), or AWS credentials (access_key:secret_key)",
         short = 'a'
     )]
     basic_auth: Option<String>,