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-rw-r--r--manual/arith.texi36
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diff --git a/manual/arith.texi b/manual/arith.texi
index 51d67a99d1..a7d6944b1f 100644
--- a/manual/arith.texi
+++ b/manual/arith.texi
@@ -828,6 +828,42 @@ The function returns zero in case the operation was successful, a
 non-zero value otherwise.
 @end deftypefun
 
+@noindent
+To control for individual exceptions if raising them causes a trap to
+occur, you can use the following two functions.
+
+@strong{Portability Note:} These functions are all GNU extensions.
+
+@comment fenv.h
+@comment GNU
+@deftypefun int feenableexcept (int @var{excepts})
+This functions enables traps for each of the exceptions as indicated by
+the parameter @var{except}.  The individual excepetions are described in
+@ref{Examining the FPU status word}.  Only the specified exceptions are
+enabled, the status of the other exceptions is not changed.
+
+The function returns the previous enabled exceptions in case the
+operation was successful, @code{-1} otherwise.
+@end deftypefun
+
+@comment fenv.h
+@comment GNU
+@deftypefun int fedisableexcept (int @var{excepts})
+This functions disables traps for each of the exceptions as indicated by
+the parameter @var{except}.  The individual excepetions are described in
+@ref{Examining the FPU status word}.  Only the specified exceptions are
+disabled, the status of the other exceptions is not changed.
+
+The function returns the previous enabled exceptions in case the
+operation was successful, @code{-1} otherwise.
+@end deftypefun
+
+@comment fenv.h
+@comment GNU
+@deftypefun int fegetexcept (int @var{excepts})
+The function returns a bitmask of all currently enabled exceptions.  It
+returns @code{-1} in case of failure.
+
 @node Arithmetic Functions
 @section Arithmetic Functions