diff --git a/README.md b/README.md
index 46f547b..30fa785 100644
--- a/README.md
+++ b/README.md
@@ -19,6 +19,12 @@ times **h** (height).
 `store_rect(x: int, y: int, w:int, h: int) -> SpriteRaw` :
 Store all the pixels of the given area in a `SpriteRaw`.
 
+## Constants
+`C_BLACK`, `C_WHITE`, `C_RED`, `C_GREEN`, `C_BLUE`, `C_YELLOW`, `C_PURPLE`,
+`C_CYAN`.
+
+`PALLET_STR`, `PALLET_BYTE`.
+
 ## Sprite classes (WIP)
 `SpriteIndexed` : indexed sprite. Draw using pallets.