Explain floor() values on Alpha.

diff --git a/FAQ.in b/FAQ.in
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--- a/FAQ.in
+++ b/FAQ.in
@@ -1476,6 +1476,14 @@ filesystem support :-( ).  To get a working make you can use either make
 3.75 or patch 3.77.  A working patch is available via RedHat's Rawhide server
 (ftp://rawhide.redhat.com/SRPMS/SRPMS/make-3.77-*src.rpm).
 
+??     Why do so many programs using math functions fail on my AlphaStation?
+
+{AO} The functions floor() and floorf() use an instruction that is not
+implemented in some old PALcodes of AlphaStations.  This may cause
+`Illegal Instruction' core dumps or endless loops in programs that
+catch these signals.  Updating the firmware to a 1999 release has
+fixed the problem on an AlphaStation 200 4/166.
+
 \f
 Answers were given by:
 {UD} Ulrich Drepper, <drepper@cygnus.com>
@@ -1490,6 +1498,7 @@ Answers were given by:
 {GK} Geoffrey Keating, <geoffk@ozemail.com.au>
 {HJ} H.J. Lu, <hjl@gnu.org>
 {CG} Cristian Gafton, <gafton@redhat.com>
+{AO} Alexandre Oliva, <oliva@lsd.ic.unicamp.br>
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