add comment to test

qtconsole/tests/test_ansi_code_processor.py

@@ -186,6 +186,10 @@ def test_move_cursor_up(self):
         """Are the ANSI commands for the cursor movement actions
         (movement up and to the beginning of the line) processed correctly?
         """
+        #This line moves the cursor up once, then moves it up five more lines.
+        #Next, it moves the cursor to the beginning of the previous line, and
+        #finally moves it to the beginning of the fifth line above the current 
+        #position
         string = '\x1b[A\x1b[5A\x1b[F\x1b[5F'
         i = -1
         for i, substring in enumerate(self.processor.split_string(string)):