2017-12-23  Aurelien Jarno <aurelien@aurel32.net>

	[BZ #22596]
	* manual/arith.texi (finite): Fix the description of the return
	value.

--- a/manual/arith.texi
+++ b/manual/arith.texi
@@ -493,8 +493,8 @@
 @comment BSD
 @deftypefunx int finitel (long double @var{x})
 @safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}}
-This function returns a nonzero value if @var{x} is finite or a ``not a
-number'' value, and zero otherwise.
+This function returns a nonzero value if @var{x} is neither infinite nor
+a ``not a number'' value, and zero otherwise.
 @end deftypefun
 
 @strong{Portability Note:} The functions listed in this section are BSD
