diff --git a/README.md b/README.md
index 48104ea..2a78216 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,11 @@
 
 [![Build](https://github.com/ZJU-SEC/CIAnalyser/actions/workflows/build.yml/badge.svg)](https://github.com/ZJU-SEC/CIAnalyser/actions/workflows/build.yml)
 
+
+> `CIAnalyser` is a tool developed for our paper: _Understanding Security Threats in Open Source Software CI/CD Scripts_. It is intended to crawl repositories with OSS CI configured and analyze the meta information.
+
+For the latest release and the dataset, check [here](https://github.com/ZJU-SEC/CIAnalyser/releases/tag/v3).
+
 ## :gear: Prerequisite
 
 - Docker
@@ -35,7 +40,25 @@ $ go build CIAnalyser
 
 ## :rocket: Run
 
+```
+$ ./CIAnalyser <stage-code>
 
-```bash
-$ ./CIAnalyser
+These are common stage code used in various situations:
+
+crawl data:
+  index-repo            crawl repos via GitHub API
+  clone-repo            Git clone the crawled repos
+  clone-script          Git clone the CI scripts
+  crawl-verified        crawl the verified CI scripts
+  
+prepare for analysis: 
+  extract-script        extract the CI scripts dependency
+  categorize-script     categorize CI scripts to find 
+  parse-using           get runtime environment of each CI script
+  label-usage           count the reference type of the script usage
+  label-lag             calculate reference lag of the script usage
+  extract-credential    extract credential usage in repos
+  
+generate analysis report:
+  analyze
 ```