diff --git a/Misc/NEWS.d/next/Library/2017-10-30-15-55-32.bpo-31900.-S9xc4.rst b/Misc/NEWS.d/next/Library/2017-10-30-15-55-32.bpo-31900.-S9xc4.rst
@@ -5,5 +5,5 @@ the ``LC_NUMERIC`` locale is different than the ``LC_CTYPE`` locale.  This
temporary change affects other threads.

Same change for the :meth:`str.format` method when formatting a number
-(:class:`int`, :class:`float`, :class:`float` and subclasses) with the ``n``
type (ex: ``'{:n}'.format(1234)``).
diff --git a/Modules/_decimal/libmpdec/mpdecimal.h b/Modules/_decimal/libmpdec/mpdecimal.h
@@ -397,6 +397,7 @@ typedef struct mpd_spec_t {
    const char *dot;       /* decimal point */
    const char *sep;       /* thousands separator */
    const char *grouping;  /* grouping of digits */
} mpd_spec_t;

/* output to a string */