diff --git a/cmd/zpool/zpool_main.c b/cmd/zpool/zpool_main.c
index 5aca0d325..ab652a7ce 100644
--- a/cmd/zpool/zpool_main.c
+++ b/cmd/zpool/zpool_main.c
@@ -345,7 +345,7 @@ get_usage(zpool_help_t idx)
 	case HELP_OFFLINE:
 		return (gettext("\toffline [-f] [-t] <pool> <device> ...\n"));
 	case HELP_ONLINE:
-		return (gettext("\tonline <pool> <device> ...\n"));
+		return (gettext("\tonline [-e] <pool> <device> ...\n"));
 	case HELP_REPLACE:
 		return (gettext("\treplace [-f] [-o property=value] "
 		    "<pool> <device> [new-device]\n"));