diff -r a0cfb8c7dfb3 Doc/library/exceptions.rst
--- a/Doc/library/exceptions.rst	Wed Jun 27 15:37:47 2012 +0200
+++ b/Doc/library/exceptions.rst	Thu Jun 28 09:26:10 2012 -0700
@@ -42,7 +42,7 @@ include the originating exception(s) and
 This implicit exception chain can be made explicit by using :keyword:`from` with
 :keyword:`raise`.  The single argument to :keyword:`from` must be an exception
 or ``None``. It will be set as :attr:`__cause__` on the raised exception.
-Setting :attr:`__cause__` implicitly sets the :attr:`__suppress_context__` to
+Setting :attr:`__cause__` implicitly sets :attr:`__suppress_context__` to
 ``True``. If :attr:`__cause__` is an exception, it will be displayed. If
 :attr:`__cause__` is present or :attr:`__suppress_context__` has a true value,
 :attr:`__context__` will not be displayed.
@@ -51,6 +51,9 @@ In either case, the default exception ha
 remaining links in the :attr:`__context__` chain if :attr:`__cause__` has been
 set.
 
+Note:  Because using :keyword:`from` can throw away valuable debugging
+information, its use with a bare :keyword:`raise` is not supported.
+
 
 Base classes
 ------------