diff --git a/cmd/zpool/zpool_main.c b/cmd/zpool/zpool_main.c
index aa166a9c03fe..8a0fa2c2be3c 100644
--- a/cmd/zpool/zpool_main.c
+++ b/cmd/zpool/zpool_main.c
@@ -248,8 +248,8 @@ get_usage(zpool_help_t idx) {
 	case HELP_ONLINE:
 		return (gettext("\tonline <pool> <device> ...\n"));
 	case HELP_REPLACE:
-		return (gettext("\treplace [-f] <pool> <device> "
-		    "[new-device]\n"));
+		return (gettext("\treplace [-f] [-o property=value] "
+		    "<pool> <device> [new-device]\n"));
 	case HELP_REMOVE:
 		return (gettext("\tremove <pool> <device> ...\n"));
 	case HELP_REOPEN:
diff --git a/man/man8/zpool.8 b/man/man8/zpool.8
index 2ae8b13085cf..e429d38e597c 100644
--- a/man/man8/zpool.8
+++ b/man/man8/zpool.8
@@ -130,7 +130,7 @@ zpool \- configures ZFS storage pools
 
 .LP
 .nf
-\fBzpool replace\fR [\fB-f\fR] \fIpool\fR \fIdevice\fR [\fInew_device\fR]
+\fBzpool replace\fR [\fB-f\fR] [\fB-o\fR \fIproperty=value\fR]  \fIpool\fR \fIdevice\fR [\fInew_device\fR]
 .fi
 
 .LP
@@ -1676,7 +1676,7 @@ Removes the specified device from the pool. This command currently only supports
 .ne 2
 .mk
 .na
-\fB\fBzpool replace\fR [\fB-f\fR] \fIpool\fR \fIold_device\fR [\fInew_device\fR]\fR
+\fB\fBzpool replace\fR [\fB-f\fR] [\fB-o\fR \fIproperty=value\fR] \fIpool\fR \fIold_device\fR [\fInew_device\fR]\fR
 .ad
 .sp .6
 .RS 4n
@@ -1696,6 +1696,17 @@ The size of \fInew_device\fR must be greater than or equal to the minimum size o
 Forces use of \fInew_device\fR, even if its appears to be in use. Not all devices can be overridden in this manner.
 .RE
 
+.sp
+.ne 2
+.mk
+.na
+\fB\fB-o\fR \fIproperty=value\fR
+.ad
+.sp .6n
+.RS 6n
+Sets the given pool properties. See the "Properties" section for a list of valid properties that can be set. The only property supported at the moment is \fBashift\fR.  \fBDo note\fR that some properties (among them \fBashift\fR) are \fInot\fR inherited from a previous vdev. They are vdev specific, not pool specific.
+.RE
+
 .RE
 
 .sp