diff --git a/docs/about.md b/docs/about.md
index 06b4f0e..d804e30 100644
--- a/docs/about.md
+++ b/docs/about.md
@@ -1,17 +1,10 @@
-# This is about document
+# Developement
+This part containts developement milestones with accompaning documents. 
 
-## Second level subtitle
+## 1. Technical requirements
+The technical requirements for O-ESD hardware are summarized along with review of multiple ESD guns available on the market. Technical specifications of hardware on the market are compared to the specification from IEC61000-4-2 standard.
+[Technical requirements] (https://o-esd.etf.bg.ac.rs/forgejo/dragan.olcan/O-ESD/raw/branch/main/Documents/O-ESD-01.pdf) 
 
-### Third level subtitle
-
-* Bullet 1
-* Bullet 2 
-
-code snippet
-```bash
-#!/bin/bash
-
-echo "Hello world!"
-```
-
-[My doc](https://o-esd.etf.bg.ac.rs/forgejo/dragan.olcan/O-ESD/raw/branch/main/Documents/O-ESD-02.pdf) 
+## 2. Schematics and considered realizations of O-ESD 
+Various approaches considered as possible solutions for O-ESD are given along with the schematics in LTspice program. 
+[Schematics and possible realizations of high-voltage generator for O-ESD] (https://o-esd.etf.bg.ac.rs/forgejo/dragan.olcan/O-ESD/raw/branch/main/Documents/O-ESD-01.pdf)