update README to clarify requirements

README.md

@@ -11,7 +11,14 @@ Analyse patterns: Use natural language processing (NLP) to detect frequent keywo
 Beyond programming, the project involves applying ethical research principles, handling data responsibly, and designing for non-technical users. By the end, the project will demonstrate how computer science can bridge technology and social research — turning raw online interactions into meaningful cultural insights.
 
 # Requirements
-## Ubuntu / Debian
+
+- **Python** ≥ 3.9
+- **Docker Compose**
+- **Python packages** listed in `requirements.txt`  
+
+⚠️ Some packages require system-level PostgreSQL libraries. Install them as follows:
+
+### Ubuntu / Debian
 `sudo apt install libpq-dev python3-dev`
-## Arch
+### Arch
 `sudo pacman -S postgresql-libs postgresql`