diff --git a/README.md b/README.md
index 2b009f5..e2ccb00 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@
 - [x] 0.1  - Grid
 - [x] 0.2  - Basic shapes (falling + collision with floor)
 - [x] 0.3  - Shapes: Lock + spawn
-- [ ] 0.4  - Collision with with blocks in grid
+- [x] 0.4  - Collision with with blocks in grid
 - [ ] 0.5  - left/right movement
 - [ ] 0.6  - Shapes rotation
 - [ ] 0.7  - Soft Drop