diff --git a/contrib/groff/tmac/doc-syms b/contrib/groff/tmac/doc-syms
index e89b658a2ca..84f2a4f65a8 100644
--- a/contrib/groff/tmac/doc-syms
+++ b/contrib/groff/tmac/doc-syms
@@ -659,6 +659,8 @@
 .as doc-str-St--susv2          " (\*[Lq]\*[doc-Tn-font-size]SUSv2\*[doc-str-St]\*[Rq])
 .ds doc-str-St--susv3          Version\~3 of the Single \*[doc-Tn-font-size]UNIX\*[doc-str-St] Specification
 .as doc-str-St--susv3          " (\*[Lq]\*[doc-Tn-font-size]SUSv3\*[doc-str-St]\*[Rq])
+.ds doc-str-St--susv4          Version\~4 of the Single \*[doc-Tn-font-size]UNIX\*[doc-str-St] Specification
+.as doc-str-St--susv4          " (\*[Lq]\*[doc-Tn-font-size]SUSv4\*[doc-str-St]\*[Rq])
 .ds doc-str-St--svid4          System\~V Interface Definition, Fourth Edition
 .as doc-str-St--svid4          " (\*[Lq]\*[doc-Tn-font-size]SVID\*[doc-str-St]\^4\*[Rq])
 .ds doc-str-St--xbd5           \*[doc-Tn-font-size]X/Open\*[doc-str-St] Base Definitions Issue\~5
diff --git a/contrib/groff/tmac/groff_mdoc.man b/contrib/groff/tmac/groff_mdoc.man
index b9d0c367515..98943a69763 100644
--- a/contrib/groff/tmac/groff_mdoc.man
+++ b/contrib/groff/tmac/groff_mdoc.man
@@ -2097,6 +2097,8 @@ X/Open
 .St -susv2
 .It Li \-susv3
 .St -susv3
+.It Li \-susv4
+.St -susv4
 .It Li \-svid4
 .St -svid4
 .It Li \-xbd5