--- a/sudo
+++ b/sudo
@@ -14,6 +14,9 @@
 	a subset of the sudo options (both short and long) that have an equivalent in
 	doas, plus option -i (--login). Refer to sudo(1) for more information.
 
+	If you need some sudo features that are not supported in doas, replace
+	package 'doas-sudo-shim' with 'sudo': apk add sudo !doas-sudo-shim.
+
 	Please report bugs at <https://github.com/jirutka/doas-sudo-shim/issues>.
 	EOF
 }