diff --git a/etc/modprobe.d/30_security-misc_conntrack.conf b/etc/modprobe.d/30_security-misc_conntrack.conf
index 7f36327..7c51595 100644
--- a/etc/modprobe.d/30_security-misc_conntrack.conf
+++ b/etc/modprobe.d/30_security-misc_conntrack.conf
@@ -7,6 +7,7 @@
 ## Disabling it reduces the kernel attack surface and improves security.
 ##
 ## https://conntrack-tools.netfilter.org/manual.html
+## https://home.regit.org/netfilter-en/secure-use-of-helpers/
 ## https://forums.whonix.org/t/disable-conntrack-helper/18917
 ##
 options nf_conntrack nf_conntrack_helper=0