diff --git a/3_Intermediate.org b/3_Intermediate.org
index 7804eb1..bef07bc 100644
--- a/3_Intermediate.org
+++ b/3_Intermediate.org
@@ -550,6 +550,11 @@ guessNum nbTry nbToFound = do
           guessNum (nbTry + 1) nbToFound
 #+END_SRC
 
+#+BEGIN_COMMENT
+****** TODO Let's explain each line of the that function.
+#+END_COMMENT
+
+
 The full program is then:
 
 #+BEGIN_SRC haskell :tangle code/guess_number.hs
@@ -654,7 +659,7 @@ You found it in 5 tries.
 
  With that you have the ability to read stdin and print things.
 
- - ~if τ then f1 else f2~ where =τ :: Bool= and the type of f1 and f2 must be the
+ - ~if τ then f1 else f2~ where =τ :: Bool= and the type of ~f1~ and ~f2~ must be the
       same. Generally this is denoted by: =:type f1 ~ :type f2= and that type
       will be the same as the entire ~if ‥ then ‥ else ‥~ expression.
  - you can compare things that can be compared with ~<~, ~<=~, ~>~, ~>=~, ~==~, ~/=~ (different).