diff --git a/lib/deployer.js b/lib/deployer.js
index 5b02b79..421c89f 100644
--- a/lib/deployer.js
+++ b/lib/deployer.js
@@ -31,7 +31,8 @@ module.exports = function(args) {
     help += '    [aws_secret]: <aws_secret>  # Optional, if provided as environment variable\n';
     help += '    [concurrency]: <concurrency>\n';
     help += '    [region]: <region>          # See https://github.com/LearnBoost/knox#region\n',
-    help += '    [headers]: <JSON headers>   # Optional, see README.md file\n\n';
+    help += '    [headers]: <JSON headers>   # Optional, see README.md file\n';
+    help += '    [prefix]: <prefix>          # Optional, prefix ending in /\n\n';
     help += 'For more help, you can check the docs: ' + chalk.underline('https://github.com/nt3rp/hexo-deployer-s3');
 
     console.log(help);
@@ -42,7 +43,8 @@ module.exports = function(args) {
     localDir: publicDir,
     deleteRemoved: true,
     s3Params: xtend({
-      Bucket: args.bucket
+      Bucket: args.bucket,
+      Prefix: args.prefix
     },customHeaders)
   }