diff --git a/docs/about.md b/docs/about.md
index ecd75fa..15dad74 100644
--- a/docs/about.md
+++ b/docs/about.md
@@ -28,7 +28,7 @@ Assessments of technical performances of O-ESD prototypes v0.1 are done and resu
 In accordance with measurement results the shapers are redesigned. [Redesigned shapers](https://o-esd.etf.bg.ac.rs/forgejo/dragan.olcan/O-ESD/src/branch/main/Hardware_development/5-Shapers)<br>
 [Design decisions](https://o-esd.etf.bg.ac.rs/forgejo/dragan.olcan/O-ESD/src/branch/main/Hardware_development/Measurements/v01/Design_decisions.txt) are made for the O-ESD.<br>
 
-##7 O-ESD prototype v0.5 assembly and verification
+## 7. O-ESD prototype v0.5 assembly and verification
 Bill of materials (BOM) for O-ESD v0.5 can be found at [BOM v0.5](https://o-esd.etf.bg.ac.rs/forgejo/dragan.olcan/O-ESD/src/branch/main/v05/Bill_of_materials.txt)<br>
 Drawings, schematics, production files and photos of assembled parts can be found at [1-Hardware](https://o-esd.etf.bg.ac.rs/forgejo/dragan.olcan/O-ESD/src/branch/main/v05/1-Hardware) in separate subfolders.<br>
 [Sketch of O-ESD v0.5](https://o-esd.etf.bg.ac.rs/forgejo/dragan.olcan/O-ESD/src/branch/main/v05/O-ESD_v0.5_drawing.jpg) and photo of [O-ESD v0.5 assembled prototype] (https://o-esd.etf.bg.ac.rs/forgejo/dragan.olcan/O-ESD/src/branch/main/v05/O-ESD_v0.5_assembled.jpg) are presented.<br>