Index: share/man/man4/pci.4
===================================================================
--- share/man/man4/pci.4
+++ share/man/man4/pci.4
@@ -333,6 +333,27 @@
 reading registers, above, also apply to writing
 .Tn PCI
 configuration registers.
+.It PCIOCATTACHED
+This
+.Xr ioctl 2
+allows user to query if a driver is loaded for the
+.Tn PCI
+specified in the passed-in
+.Va pci_io
+structure.
+The
+.Va pci_io
+structure is described aboove, however, the
+.Va pi_reg
+and
+.Va pi_width
+are not used.
+The return value from this
+.Xr ioctl 2
+is stored in
+.Va pi_data .
+A value of 0 indicates no driver is attached, while a value larger than 0
+indicates that a driver is attached.
 .It PCIOCBARMMAP
 This
 .Xr ioctl 2