diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,4 +1,23 @@
-# sprito
+# Sprito
+CG-50 Python drawing framework
 
-CG-50 Python drawing framework.
-Early Access.
\ No newline at end of file
+## Drawing functions
+`rect(x: int, y: int, w: int, h: int, color: tuple) -> None` :
+Draw a rectangle with the given **color** from (**x**;**y**) of size **w**
+(width) times **h** (height).
+
+`fill_screen(color: tuple) -> None` :
+Fill the screen with the given **color**.
+
+`invert_pixel(x: int, y: int) -> None` :
+Invert the pixel color at (**x**;**y**).
+
+`invert_rect(x: int, y: int, w: int, h: int) -> None` :
+Invert all the pixels of the rectangle from (**x**;**y**) of size **w** (width)
+times **h** (height).
+
+## Sprite classes (WIP)
+`SpriteIndexed` : indexed sprite. Draw using pallets.
+
+`SpriteRaw` : raw sprite, usually heavier than an indexed sprite but faster to
+draw.