diff --git a/README.md b/README.md
index 0c2c3f0..0811a21 100644
--- a/README.md
+++ b/README.md
@@ -1,36 +1,50 @@
-# FDF - fil de fer
+# FDF - fil de fer (french for Wire)
+---
 
-### this is an exercise to discover 3D drawing, keyboard events, and pixel images manipulation
+This project is an introduction to 3D drawing. It takes a map file and render it with its height. It listen to keyboard event to apply transformations on it, such as translation, rotations, zoom, and change in altitude factor.
 
-it reads a map, which is a simple text file like this :
+the input map is a simple text file that looks like this :
 
 ```
-0  0  0  0  0
-0  0  0  0  0
-0 10  0  0  0
-0  0  0  0  0
-0  0  0  0  0
+$> cat -e map_test.fdf
+0  0  0  0  0$
+0  0  0  0  0$
+0 10  0  0  0$
+0  0  0  0  0$
+0  0  0  0  0$
+$>
 ```
 
-and it converts it into a rectangular net, like a landscape with the height equal to the numbers :
+and the program converts it into a rectangular net, like a landscape with the height equal to the numbers :
 
 ![example 3D of map before modification](assets/fdf_demo_1.jpg)
 
-we can modify the map to change the 3D drawing :
+we can modify the map to see a new 3D model :
+
+```
+$> cat -e map_test.fdf
+0  0  0  0  0$
+1  2  3  4  5$
+0 10  8  0  0$
+0  0  0  9  0$
+0  0  0  0  0$
+$>
+```
 
 ![example 3D of map after modifications](assets/fdf_demo_2.jpg)
 
-### it is based on a library called [minilibx](https://github.com/42Paris/minilibx-linux), which is like a simplified version of X11
+# ressources
+---
 
-some of the difficulties of this program :
+- it is based on a library called minilibx : https://github.com/42Paris/minilibx-linux
+- equations to transform a 2D drawing into a perspective : https://math.stackexchange.com/questions/2305792/3d-projection-on-a-2d-plane-weak-maths-ressources/2306853#2306853
+- drawing a line between two points : https://en.wikipedia.org/wiki/Bresenham%27s_line_algorithm
+- bits manipulation for colors shifting : https://dev.to/freerangepixels/a-probably-terrible-way-to-render-gradients-1p3n
+- optimizing events response with debouncing and throttling : https://stackoverflow.com/questions/25991367/difference-between-throttling-and-debouncing-a-function
+- building images instead of asking the X library to draw each pixel one by one : https://github.com/Gontjarow/MiniLibX/blob/master/docs/mlx-tutorial-create-image.md
 
-- finding the equations to transform a 2D drawing into a perspective
-- drawing a line between two points
-- bits manipulation for colors
-- organization of the code to take care of all the events and transformations
-- building images instead of asking the minilibx library to draw each pixel one by one
-
-it can listen to keyboards events to transform the 3D, like turning around, zooming... :
+# transformations :
+---
 
 **zoom :**
 
diff --git a/includes/fdf.h b/includes/fdf.h
index 73851d1..a0afd75 100644
--- a/includes/fdf.h
+++ b/includes/fdf.h
@@ -74,10 +74,10 @@ int		is_color(char *color);
 void	size_map(t_fdf *fdf, char *raw, int height);
 int		**parse_map(t_fdf *fdf, int fd);
 
-// steps size for the hight transform with p and o
+// steps size for the height transform with p and o
 // must be > 0
 // 100 is small, 1 is the biggest
-# define Z_HEIGHT				10
+# define Z_HEIGHT				100
 // then define the speed for height transform
 // must be > 0
 // 1 is small, 100 is the big
@@ -104,12 +104,12 @@ int		**parse_map(t_fdf *fdf, int fd);
 */
 /*
 # define COLOR_END			0x877264 // brown
-# define COLOR_END			0xa263f6 // purple
 # define COLOR_END			0x1423e6 // blue
 # define COLOR_END			0xf263a6 // pink
 # define COLOR_END			0xffffff // white
-*/
 # define COLOR_END			0x00d700 // green
+*/
+# define COLOR_END			0xa263f6 // purple
 
 // pixels deplacement for each keypress
 # define MOVE						10