diff --git a/README b/README
index 1479074..dc547c8 100644
--- a/README
+++ b/README
@@ -2,3 +2,4 @@ Project to learn the vulkan API.
 
 Checkpoints:
 `42410890541d4cc67934ad383e49cfebab219d40`: first triangle rendering complete
+`2ee55ac3adae04d8a773a16220dc8f657f093ed8`: drawing a square with index buffers