diff --git a/README.md b/README.md
index 85b0883..1c4ddae 100644
--- a/README.md
+++ b/README.md
@@ -38,7 +38,7 @@ The code aims to follow the explanations from the [NES dev wiki](https://wiki.ne
 
 ## To do:
 
-- Fix any bugs with mappers 0-4 and improve mapper 5 (MMC3)
+- Fix any bugs with mappers 0-3 and improve mapper 4 (MMC3)
 
 - DMC audio channel, high- and low-pass filters