diff --git a/share/examples/etc/make.conf b/share/examples/etc/make.conf
index 21ac75377317..9054e13d6e0f 100644
--- a/share/examples/etc/make.conf
+++ b/share/examples/etc/make.conf
@@ -124,7 +124,9 @@
 #NO_MAN=		# do not build manual pages
 #NO_MODULES=		# do not build modules with the kernel
 #NO_NETCAT=		# do not build netcat
-#NO_NIS=		# do not build NIS support and related programs
+#NO_NIS=		# do not build NIS support and related programs.
+			# If set, you might need to adopt your
+			# nsswitch.conf(5) and remove `nis' entries.
 #NO_OBJC=		# do not build Objective C support
 #NO_OPENSSH=		# do not build OpenSSH
 #NO_OPENSSL=		# do not build OpenSSL (implies NO_KERBEROS/NO_OPENSSH)