diff --git a/README.md b/README.md
index c037701..9104141 100644
--- a/README.md
+++ b/README.md
@@ -1,12 +1,18 @@
 # Fillit
 
+**hulamy** and **vmanzoni**
+
 ## To do
 
 - [x] Check if we have a file
 - [x] Read file
 - [ ] Check if there are errors in file
-- [ ] Transform file into tetriminos
+  - 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
 - [ ] Backtracking for smallest square
 - [ ] Transform tetriminos to letters
 - [ ] Print result