diff --git a/debian/dash.preinst b/debian/dash.preinst
index 439e31d..2235fe9 100644
--- a/debian/dash.preinst
+++ b/debian/dash.preinst
@@ -18,6 +18,8 @@ if [ "$1" = upgrade ] && dpkg --compare-versions "$2" lt 0.5.12-9~; then
 			# We have no other debconf usage in dash, so we can purge rightaway.
 			db_purge || true
 		else
+			# The chances of anyone hitting this branch are very slim.
+			# If they do, they will appreciate letting them change their diversion.
 			echo "ERROR: Found ineffective diversion of /bin/sh!" >&2
 			echo "To keep using alternative default shell, divert /usr/bin/sh instead." >&2
 			echo "Aborting upgrade. Resolve the issue and try again." >&2