diff --git a/README.md b/README.md
index 6034e0c..917f316 100644
--- a/README.md
+++ b/README.md
@@ -1,12 +1,23 @@
 # tg_bots_scripts
 
-Scripts for telegram bot for (re)start/stop without pain.
+Scripts for telegram bot for (re)start/stop without pain. \
+**UNIX-ONLY!!!**
 
 ## Usage
 1. Put service.py in yours project.
 2. Set name of main script - `main.py`
-3. Use the `service.py` so:
+3. Inject in `main.py`:
+```python
+import os
+
+# Process Identification Number (PID in Unix(-like))
+pid = os.getpid()
+
+with open("pid.txt", "w") as f:
+    f.write(str(pid))
 ```
+4. Use the `service.py` so:
+```bash
 Usage: python service.py <option>
 
 Options: