(Glossary): Deprecate `iff'.

diff --git a/man/glossary.texi b/man/glossary.texi
index d082e6ec07716641d193a1e811d6d51251eb3ab1..f289c2ca1cbe8ea39d1c3c23f3f262a928d52f4b 100644 (file)
--- a/man/glossary.texi
+++ b/man/glossary.texi
@@ -603,7 +603,8 @@ Hyper}.
 
 @item Iff
 ``Iff'' means ``if and only if.''  This terminology comes from
-mathematics.
+mathematics.  Try to avoid using this term in documentation, since
+many are unfamiliar with it and mistake it for a typo.
 
 @item Inbox
 An inbox is a file in which mail is delivered by the operating system.