diff --git a/README.md b/README.md
index c037701..228b0b3 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,9 @@
 - [x] Check if we have a file
 - [x] Read file
 - [ ] Check if there are errors in file
+  - 4 char * 4 lines
+  - 4 blocks in 1 tetrimino
+  - No solo block
 - [ ] Transform file into tetriminos
 - [ ] Check if every tetrimino is valid
 - [ ] Backtracking for smallest square