diff --git a/TODO b/TODO
index eb49f47..564f810 100644
--- a/TODO
+++ b/TODO
@@ -6,3 +6,10 @@ Below list contains things that should be changed/fixed/implemented.
 	This syntax is unsupported yet. Should replace the array() function.
 
 2. Some builtin functions like isset() seems to be useless, if variable is not defined, interpreter will throw an error.
+
+3. Interpreter does not check, if all methods from interface being implemented are defined in class.
+
+4. object $x = new OOP(); fails with 'Return with a value in closure/method returning void'
+
+5. Accessing private attribute from parent class fails with 'Undefined class attribute' instead of error about visibility.
+