diff --git a/usr.bin/basename/basename.1 b/usr.bin/basename/basename.1
index 06b76e6bfa59..23f3f7a0ad89 100644
--- a/usr.bin/basename/basename.1
+++ b/usr.bin/basename/basename.1
@@ -93,4 +93,6 @@ The
 .Nm
 and
 .Nm dirname
-functions are expected to be POSIX 1003.2 compatible.
+functions are expected to be
+.St -p1003.2
+compatible.