diff -r a480f470c469 Doc/library/traceback.rst
--- a/Doc/library/traceback.rst	Tue Apr 21 21:09:48 2015 +0300
+++ b/Doc/library/traceback.rst	Tue Apr 21 22:56:07 2015 +0100
@@ -22,15 +22,27 @@
 
 .. 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, print the last *abs(limit)* entries
+   otherwise. 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.
 
 
+.. function:: extract_tb(traceback, limit=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:: 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 +53,7 @@
      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
@@ -61,22 +74,11 @@
 
 .. 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`.
-
-
-.. 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``.
-
+   Print up to *limit* stack trace entries (starting from the invocation point)
+   if *limit* is positive, print the last *abs(limit)* entries otherwise.  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`.
 
 .. function:: extract_stack(f=None, limit=None)