diff --git a/mmdebstrap b/mmdebstrap
index 96ccf25..73f45dd 100755
--- a/mmdebstrap
+++ b/mmdebstrap
@@ -5201,6 +5201,9 @@ machine running B<mmdebstrap>. Maintainer scripts are run without chrooting
 into I<TARGET> and rely on their dependencies being installed on the machine
 running B<mmdebstrap>. Unless B<mmdebstrap> was run inside fakeroot, the
 I<TARGET> directory will be owned by the user running B<mmdebstrap>.
+B<WARNING>: if this option is used carelessly with packages that do not support
+C<DPKG_ROOT>, this mode can result in undesired changes to the system running
+B<mmdebstrap> because maintainer-scripts will be run without B<chroot(1)>.
 
 =for TODO
 =item B<qemu>