Updated comments on using alert.

boxes.py

@@ -147,6 +147,17 @@ class Boxes(object):
 
     @staticmethod
     def alert(message, length=0, pad=2, width=78, base="red"):
+        """
+        Display alert message
+
+        length: the printable character length.
+            If the string contains color codes, you'll need
+            to use this so it will be centered properly.
+            If not given, len(message) is used.
+        pad:  The spaces at the front and back of the message.
+        width:  Defaults to 78 chars wide.
+        base: The background color to use for the alert.
+        """
         if base == "red":
             color = merge(Style.BRIGHT + Fore.YELLOW + Back.RED)
         elif base == "blue":