diff --git a/README.md b/README.md
index c171968..61a967c 100644
--- a/README.md
+++ b/README.md
@@ -20,6 +20,14 @@ This is a very very basic parser, and so it will not work with a certain number
 * if you don't use the variable for the pin numbers
 * if you write 'digitalWrite()' on several lines
 * if you move the loop() opening bracket on the next line
-* if the main loop() call others functions
 * if you use arduino or c++ specific functions
 * ...
+
+# Debug Level
+
+There is a variable "DEBUG_LEVEL" in the ``src/pin_handler.h``, it allows you to give more or less output to the student.
+
+With a value of 1, it will print each code the student try.
+
+With a value of 2, it will do 1 and each time a digitalWrite is executed, it will print the wire change (1-4: row, 5-8: col) and the state to change.
+