diff --git a/README.md b/README.md
index 4a5a481..8f15937 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 [![Build Status](https://drone.opytex.org/api/badges/lafrite/Bopytex/status.svg)](https://drone.opytex.org/lafrite/Bopytex)
 
-Bopytex is a command line tool for producing random math exercises with their correction. It embeds [mapytex](https://git.opytex.org/lafrite/Mapytex) and [python](python.org) into [latex](latex-project.org) through [jinja](jinja.pocoo.org).
+Bopytex is a command line tool which embed python into latex. It uses jinja2 to do so with a modified environnement to match with latex syntax.
 
 ## Installing
 
@@ -12,84 +12,75 @@ Install and update using [pip](https://pip.pypa.io/en/stable/quickstart/)
 
 ## Simple example
 
-Let's say I want an exercise on adding 2 fractions (files are in `examples`).
+``` latex
+% save this as tpl_simple.tex
+\documentclass[12pt]{article}
 
-The *latex* template called `tpl_add_fraction.tex`
+\title{Bopytex example -- {{ number }}}
+
+\begin{document}
+
+\maketitle
+%- set a = 10
+%- set n = 2
+We have two variables
+\begin{itemize}
+    \item a: \Var{a}
+    \item n: \Var{n}
+\end{itemize}
+
+%# We can use blocks
+\begin{itemize}
+%- for i in n
+    \item \Var{a}
+%- endfor
+\end{itemize}
+
+
+\end{document}
+
+```
+
+To create a version a this document type this
+
+``` bash
+$ bopytex tpl_simple.tex
+```
+
+## How I use it
+
+I build this program to produce individual exams subjects for each of my student with the correction associated. I write a template, and bopytex build subject and correction.
+
+To produce formulas and values, I use an another tool I an developing: `mapytex <https://git.opytex.org/lafrite/Mapytex`. I am importing it through `bopytex_config.py`.
+
+``` python
+# bopytex_config.py
+from mapytex import Expression
+from random import random
+```
+
+Every variables, objects or function inside this file will be available inside the template.
 
 ``` latex
+% tpl_example.tpl
 \documentclass[12pt]{article}
 
+\title{Bopytex with Mapytex example -- \Var{ number }}
+
 \begin{document}
 
-\section{Ajouts de fractions}
+\maketitle
 
-Adding two fractions
-%- set e = Expression.random("{a} / {b} + {c} / {k*b}", ["b > 1", "k>1"])
-\[
-    A = \Var{e}
-\]
-Solution 
-\[
-    \Var{e.simplify().explain() | join('=')}
-\]
-\end{document}
-```
+%- set e = Expression.random("{a} + {b}")
+\Var{e}
 
-Generate latex files and compile those for 2 different subjects.
-
-```
-bopytex -t tpl_add_fractions.tex -N 2
-```
-
-It produces 2 sources files
-
-- `01_add_fractions.tex`
-
-```latex
-\documentclass[12pt]{article}
-
-\begin{document}
-
-\section{Ajouts de fractions}
-
-Adding two fractions
-\[
-    A = \frac{- 2}{4} + \frac{7}{8}
-\]
-Solution 
-\[
-    \frac{- 2}{4} + \frac{7}{8}=\frac{- 2 \times 2}{4 \times 2} + \frac{7}{8}=\frac{- 4}{8} + \frac{7}{8}=\frac{- 4 + 7}{8}=\frac{3}{8}
-\]
+\Var{e.simplify()}
 
 \end{document}
 ```
 
-- `02_add_fractions.tex`
+Then I can produce multiple documents (3 here)
 
-```latex
-\documentclass[12pt]{article}
-
-\begin{document}
-
-\section{Ajouts de fractions}
-
-Adding two fractions
-\[
-    A = \frac{8}{9} + \frac{3}{63}
-\]
-Solution 
-\[
-    \frac{8}{9} + \frac{3}{63}=\frac{8 \times 7}{9 \times 7} + \frac{3}{63}=\frac{56}{63} + \frac{3}{63}=\frac{56 + 3}{63}=\frac{59}{63}
-\]
-
-\end{document}
+``` bash
+$ bopytex tpl_simple.tex -q 3 -c bopytex_config.py
 ```
-
-And a ready to print pdf.
-
-- [ all_add_fraction.pdf ]( ./examples/all_add_fraction.pdf )
-
-
-
-
-