diff --git a/README b/README
index f986228..304388b 100644
--- a/README
+++ b/README
@@ -20,8 +20,10 @@ $ <SLE binary path> -tileset <tileset> -level <KBLE level to open>
 Example:
 $ build/sle -tileset assets/tileset.png -level sample.kble
 
-USAGE
-=====
+SYNOPSIS
+========
+usage: sle -tileset path -level path [options]
+
 Two windows should appear. A main window, with the level you are
 currently editing, and a secondary one, containing the tileset you
 provided.
@@ -30,9 +32,8 @@ This software is controlled using a mice.
 
 Main window - Editing Area
 --------------------------
-Use then:
-* left click: draw with selected tile
-* right click: erase (tile 0)
+Left click: draw with selected tile
+Right click: erase (tile 0)
 
 Secondary window - Tile Picker
 ------------------------------
@@ -43,9 +44,32 @@ Exit and save
 Close/kill the main window. The secondary window will close automaticly
 and your modifications to the level file will be writen to disk.
 
-CONFIGURATION
-=============
-Edit include/conf.h to configure the software. Read the comments!
+FLAGS
+======
+
+Mendatory flags
+---------------
+All these options take a path to a file as argument.
+-tileset Tileset image
+-level   KBLE file
+
+Optionnal flags
+---------------
+All these options take integers as argument.
+
+-tile-width
+-tile-height
+-editor-width
+-editor-height
+-editor-target-fps
+-editor-off-x
+-editor-off-y
+-picker-target-fps
+-picker-padding
+
+DEFAULT CONFIGURATION
+=====================
+Edit include/conf.h to change default configuration. Read the comments!
 Don't forget to recompile after you made your modifications.
 
 LICENSE