diff --git a/README.md b/README.md
index 326fbef..bf3c26c 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 
-Immediate Mode GUI app with naive visualisation for elastic balls collisions.
+Immediate Mode GUI app with naive visualization for elastic balls collisions.
 
 # Build & run 
 
@@ -10,4 +10,10 @@ cargo run --package=egui-circles                               # build & run
 
 # HowTo
 
-Detailed information on how to use [egui](https://github.com/emilk/egui) rust library can found [here](https://egui.info/).  
\ No newline at end of file
+## ImGui
+
+Detailed information on how to use [egui](https://github.com/emilk/egui) rust library can found [here](https://egui.info/).
+
+## Math
+
+A simple explanation of [[Home]] [Collisions2D.pdf] 2D vector math silently working behind the coalitions simulation.