diff --git a/README.md b/README.md
index 228b0b3..e5350f9 100644
--- a/README.md
+++ b/README.md
@@ -5,11 +5,12 @@
 - [x] Check if we have a file
 - [x] Read file
 - [ ] Check if there are errors in file
+  - At least 1 tetrimino or less than 26
+- [ ] Check if every tetrimino is valid
   - 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
 - [ ] Transform tetriminos to letters
 - [ ] Print result