diff --git a/gnu/usr.bin/groff/tmac/mdoc.local b/gnu/usr.bin/groff/tmac/mdoc.local
index 75f7b1071810..53fbc7de76c7 100644
--- a/gnu/usr.bin/groff/tmac/mdoc.local
+++ b/gnu/usr.bin/groff/tmac/mdoc.local
@@ -57,6 +57,7 @@
 .\" FreeBSD releases not found in doc-common
 .ds doc-operating-system-FreeBSD-4.9    4.9
 .ds doc-operating-system-FreeBSD-5.1    5.1
+.ds doc-operating-system-FreeBSD-5.2    5.2
 .
 .ec
 .