diff --git a/README.md b/README.md
index 9a81466..c981cbf 100644
--- a/README.md
+++ b/README.md
@@ -2,60 +2,65 @@
 Zero Storage Captcha selfhosted REST API service
 
 ## Compile
-Qt5 and OpenSSL are required
+
 ```
-sudo apt install git qt5-default libssl-dev
+sudo apt install git qtdeclarative5-dev
 git clone --recursive https://github.com/ZeroStorageCaptcha/api-daemon.git zero-captcha-daemon
 cd zero-captcha-daemon
 qmake && make
 ```
 
 ## Run
+
 ```
--a --address  Address to bind
+-a --address  Address to bind (127.0.0.1 by default)
 -p --port     Port to bind (7697 by default)
 -t --threads  Working threads (hardware value by default)
 ```
 
+For Linux systems with systemd check `systemd` folder which contains service file example.
+
 ## API
+
 GET request, JSON response
 
 **Each response contains a boolean "status" that indicates the logic success of the operation. If !status, read "message" field.**
 
 1. Generate captcha
    ```
-   -> /generate?length= [>0] &difficulty= [0-5] &output= [base64|file] IF output=file: &filepath= [file system path]
-   <- "token", IF output=base64: "png" (base64 encoded picture)
+   -> /generate?length=CAPTCHA_TEXT_LENGTH&difficulty=0|1|2"
+   <- { "token": "CAPTCHA_TOKEN", "png": "BASE64_ENCODED_PICTURE" }
    ```
 2. Validate captcha
    ```
-   -> /validate?answer= [user's answer] &token = [user's token]
-   <- boolean "valid"
+   -> /validate?answer=CAPTCHA_ANSWER&token=CAPTCHA_TOKEN
+   <- { "valid": true|false }
    ```
 3. Settings
 
     3.1 Tokens case sensitive to captcha answer:
     ```
-     -> /settings?case_sensitive= [enable|disable]
+     -> /settings?case_sensitive=enable|disable
     ```
-    3.2 Only numbers mode:
+    3.2 Numbers only mode:
     ```
-    -> /settings?number_mode= [enable|disable]
+    -> /settings?number_mode=enable|disable
     ```
 ## Example
+
 1. Generate
    ```
-   Client: /generate?length=4&difficulty=3&output=base64 
+   Client: /generate?length=4&difficulty=1
    Server: 
    {
      "png": "iVBORw0KGgoAAAANSU <...> AAAAAElFTkSuQmCC",
      "status": true,
-     "token":" i2oefBw6mswaORIphgDcY7GwnS"
+     "token":" i2oefBw6mswaORIphgDcY7GwnS_532"
    }
    ```
 2. Validate
    ```
-   Client: /validate?answer=iuda1&token=i2oefBw6mswaORIphgDcY7GwnS
+   Client: /validate?answer=iuda1&token=i2oefBw6mswaORIphgDcY7GwnS_532
    Server: 
    {
      "status": true,