diff --git a/lib/libsys/pathconf.2.orig b/lib/libsys/pathconf.2
--- a/lib/libsys/pathconf.2.orig
+++ b/lib/libsys/pathconf.2
@@ -25,7 +25,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd May 3, 2025
+.Dd July 5, 2025
 .Dt PATHCONF 2
 .Os
 .Sh NAME
@@ -179,6 +179,14 @@
 Return 1 if named attributes are enabled for the file system, otherwise 0.
 .It Li _PC_HAS_NAMEDATTR
 Return 1 if one or more named attributes exist for the file, otherwise 0.
+.It Li _PC_HAS_HIDDENSYSTEM
+Return 1 if both
+.Dv UF_HIDDEN
+and
+.Dv UF_SYSTEM
+flags can be set by
+.Xr chflags 2 ,
+otherwise 0.
 .El
 .Sh RETURN VALUES
 If the call to
@@ -255,6 +263,7 @@
 Corrupted data was detected while reading from the file system.
 .El
 .Sh SEE ALSO
+.Xr chflags 2 ,
 .Xr lseek 2 ,
 .Xr sysctl 3
 .Sh HISTORY