diff --git a/contrib/mandoc/mdoc.7 b/contrib/mandoc/mdoc.7
--- a/contrib/mandoc/mdoc.7
+++ b/contrib/mandoc/mdoc.7
@@ -2606,6 +2606,11 @@
 .br
 Floating-point arithmetic.
 .Pp
+.It \-ieee754-2008
+.St -ieee754-2008
+.br
+Floating-point arithmetic, 2008 revision.
+.Pp
 .It \-iso8601
 .St -iso8601
 .br
diff --git a/contrib/mandoc/st.c b/contrib/mandoc/st.c
--- a/contrib/mandoc/st.c
+++ b/contrib/mandoc/st.c
@@ -65,6 +65,7 @@
 LINE("-ansiC",		"ANSI X3.159-1989 (\\(lqANSI\\~C89\\(rq)")
 LINE("-ansiC-89",	"ANSI X3.159-1989 (\\(lqANSI\\~C89\\(rq)")
 LINE("-ieee754",	"IEEE Std 754-1985")
+LINE("-ieee754-2008",	"IEEE Std 754-2008")
 LINE("-iso8802-3",	"ISO 8802-3: 1989")
 LINE("-iso8601",	"ISO 8601")
 LINE("-ieee1275-94",	"IEEE Std 1275-1994 (\\(lqOpen Firmware\\(rq)")