Index: zpool.8
===================================================================
--- zpool.8	(revision 255873)
+++ zpool.8	(working copy)
@@ -143,7 +143,7 @@
 .Nm
 .Cm replace
 .Op Fl f
-.Ar pool device
+.Ar pool old_device
 .Op Ar new_device
 .Nm
 .Cm scrub
@@ -1433,7 +1433,7 @@
 .Nm
 .Cm replace
 .Op Fl f
-.Ar pool device
+.Ar pool old_device
 .Op Ar new_device
 .Xc
 .Pp