diff -r 5cab0ada97b2 Lib/difflib.py
--- a/Lib/difflib.py	Sun Mar 16 15:56:24 2014 -0500
+++ b/Lib/difflib.py	Sun Mar 16 21:05:00 2014 -0600
@@ -1302,11 +1302,14 @@
     functions (or None):
 
     - linejunk: A function that should accept a single string argument, and
-      return true iff the string is junk.  The default is None, and is
-      recommended; as of Python 2.3, an adaptive notion of "noise" lines is
-      used that does a good job on its own.
+      return true if the string is junk.  The default is None, and is
+      recommended; as of Python 2.3, the underlying SequenceMatcher class does
+      a dynamic analysis of which lines are so frequent as to constitute noise, 
+      the idea is to find the longest contiguous matching subsequence that 
+      contains no "junk" elements.
 
-    - charjunk: A function that should accept a string of length 1. The
+    - charjunk: A function that should accepts a character (string of length 1),
+      and returns true if the character is junk, or false if not. The
       default is module-level function IS_CHARACTER_JUNK, which filters out
       whitespace characters (a blank or tab; note: bad idea to include newline
       in this!).