diff --git a/README.md b/README.md
index faa41ac..4703e70 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,75 @@
 # simple http file api
 
+## Configuration
+
+API_KEY: if set, then the client must send the authrization header with the value "Bearer {API_KEY}", otherwise the api returnes 401. If not set, no authentication needed
+
+UPLOAD_PATH: path, where the uploaded files will be stored
+CONFIG: config in json format
+e.g.
+{ 
+    "uploadGroups": [
+        { 
+            "matcher": "^mmkb-android-[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}-int.apk$", "groupSize": 3 
+        } 
+    ] 
+}
+
+uploadGroups:  groups of files defined by a regex matcher. For each group can be set a groupSize property. If the file count in the group is more then the groupSize,
+then the oldest files in the group will be deleted.
+
+## API
+
+### get all uploaded files
+
+path: /
+method: GET
+
+get all uploaded files
+
+### get the sate of the actual upload groups
+
+path: /state
+method: GET
+
+Get the state of the actual upload groups
+
+### Cleanup
+
+path: /clean
+
+Execute a cleanup manually.
+Cleanup is beased on the uploadGroups configuration
+
+### Get file
+
+path /:filename
+method: GET
+
+get the file with the given name
+
+### Delete file
+
+path /:filename
+method: DELETE
+
+Delete the file with the given name
+
+### Upload file
+
+path /
+method: POST
+
+Upload a file. If file with the given name already exists, http status 409 will be returned.
+After a successfull file upload, a cleanup will be performed
+
+### Upload file
+
+path /
+method: PUT
+
+Upload a file. If the file with the given name already exists, it will be overwritten
+After a successfull file upload, a cleanup will be performed
  
 
 ## Create Docker image
diff --git a/index.js b/index.js
index 5ac8423..b75095b 100644
--- a/index.js
+++ b/index.js
@@ -8,7 +8,7 @@ const port = 3000;
 
 const uploadPath = process.env.UPLOAD_PATH || '/tmp';
 const config = process.env.CONFIG || "{ \"uploadGroups\": [] }";
-//const config = process.env.CONFIG || "{ \"uploadGroups\": [{ \"matcher\": \"^mmkb-android-.*-test\\.apk$\", \"groupSize\": 3},{ \"matcher\": \"^mmkb-android-.*-int\\.apk$\", \"groupSize\": 3},{ \"matcher\": \"^mmkb-android-.*-prod\\.apk$\", \"groupSize\": 3}] }";
+
 
 console.info("Upload path: ", uploadPath);  
 console.info("Config: ", config);   
@@ -184,5 +184,5 @@ app.get('/:filename', (req, res) => {
 });
 
 app.listen(port, () => {
-    console.log(`Example app listening on port ${port}`);
+    console.log(`Start app listening on port ${port}`);
 });
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