Index: share/man/man4/rtsx.4
===================================================================
--- share/man/man4/rtsx.4
+++ share/man/man4/rtsx.4
@@ -110,6 +110,11 @@
 .Bd -ragged
 .Cd options    RTSX_INVERSION
 .Ed
+.Pp
+Or with:
+.Bd -ragged
+.Cd sysctl dev.rtsx.0.inversion=1
+.Ed
 .It
 Mounting a filesystem with write access on a card write protected may involve a kernel crash.
 .El