diff --git a/gnu/usr.bin/groff/tmac/mdoc.local b/gnu/usr.bin/groff/tmac/mdoc.local
index 4d56befd9d73..3ee10937364f 100644
--- a/gnu/usr.bin/groff/tmac/mdoc.local
+++ b/gnu/usr.bin/groff/tmac/mdoc.local
@@ -62,6 +62,8 @@
 .ds doc-operating-system-FreeBSD-10.0   10.0
 .ds doc-operating-system-FreeBSD-10.1   10.1
 .ds doc-operating-system-FreeBSD-11.0   11.0
+.
+.\" Definitions for other *BSDs not (yet) in doc-common
 .ds doc-operating-system-NetBSD-7.0     7.0
 .
 .\" Definitions not (yet) in doc-syms