diff -r aa60f4d1a569 Doc/library/traceback.rst
--- a/Doc/library/traceback.rst	Wed Apr 22 11:32:19 2015 +0300
+++ b/Doc/library/traceback.rst	Wed Apr 22 14:22:28 2015 +0100
@@ -22,15 +22,19 @@
 
 .. function:: print_tb(traceback, limit=None, file=None)
 
-   Print up to *limit* stack trace entries from *traceback*.  If *limit* is omitted
-   or ``None``, all entries are printed. If *file* is omitted or ``None``, the
-   output goes to ``sys.stderr``; otherwise it should be an open file or file-like
-   object to receive the output.
+   Print up to *limit* stack trace entries from *traceback* (starting from the
+   caller's frame) if *limit* is positive. Otherwise, print the last 
+   ``abs(limit)`` entries. If *limit* is omitted or ``None``, all entries are 
+   printed. If *file* is omitted or ``None``, the output goes to ``sys.stderr``;
+   otherwise it should be an open file or file-like object to receive the output.
+
+   .. versionchanged:: 3.5
+       Added negative *limit* support.
 
 
 .. function:: print_exception(type, value, traceback, limit=None, file=None, chain=True)
 
-   Print exception information and up to *limit* stack trace entries from
+   Print exception information and stack trace entries from
    *traceback* to *file*. This differs from :func:`print_tb` in the following
    ways:
 
@@ -41,6 +45,7 @@
      prints the line where the syntax error occurred with a caret indicating the
      approximate position of the error.
 
+   The optional *limit* argument has the same meaning as for :func:`print_tb`.
    If *chain* is true (the default), then chained exceptions (the
    :attr:`__cause__` or :attr:`__context__` attributes of the exception) will be
    printed as well, like the interpreter itself does when printing an unhandled
@@ -49,7 +54,8 @@
 
 .. function:: print_exc(limit=None, file=None, chain=True)
 
-   This is a shorthand for ``print_exception(*sys.exc_info())``.
+   This is a shorthand for ``print_exception(*sys.exc_info(), limit=limit, 
+   file=file, chain=chain)``.
 
 
 .. function:: print_last(limit=None, file=None, chain=True)
@@ -61,21 +67,26 @@
 
 .. function:: print_stack(f=None, limit=None, file=None)
 
-   This function prints a stack trace from its invocation point.  The optional *f*
-   argument can be used to specify an alternate stack frame to start.  The optional
-   *limit* and *file* arguments have the same meaning as for
-   :func:`print_exception`.
+   Print up to *limit* stack trace entries (starting from the invocation point)
+   if *limit* is positive. Otherwise, print the last ``abs(limit)`` entries.  
+   If *limit* is omitted or ``None``, all entries are printed.  The optional *f*
+   argument can be used to specify an alternate stack frame to start. The optional
+   *file* argument has the same meaning as for :func:`print_tb`.
+
+   .. versionchanged:: 3.5
+          Added negative *limit* support.
 
 
 .. function:: extract_tb(traceback, limit=None)
 
-   Return a list of up to *limit* "pre-processed" stack trace entries extracted
-   from the traceback object *traceback*.  It is useful for alternate formatting of
-   stack traces.  If *limit* is omitted or ``None``, all entries are extracted.  A
-   "pre-processed" stack trace entry is a 4-tuple (*filename*, *line number*,
-   *function name*, *text*) representing the information that is usually printed
-   for a stack trace.  The *text* is a string with leading and trailing whitespace
-   stripped; if the source is not available it is ``None``.
+   Return a list of "pre-processed" stack trace entries extracted from the
+   traceback object *traceback*.  It is useful for alternate formatting of stack
+   traces.  The optional *limit* argument has the same meaning as for
+   :func:`print_tb`.  A "pre-processed" stack trace entry is a 4-tuple
+   (*filename*, *line number*, *function name*, *text*) representing the
+   information that is usually printed for a stack trace.  The *text* is a
+   string with leading and trailing whitespace stripped; if the source is not
+   available it is ``None``.
 
 
 .. function:: extract_stack(f=None, limit=None)