diff --git a/cloudflare_owned_NS.txt b/cloudflare_owned_NS.txt
index 4cd4d79b6..ebe6c958b 100644
--- a/cloudflare_owned_NS.txt
+++ b/cloudflare_owned_NS.txt
@@ -11,11 +11,13 @@ art.ns.cloudflare.com
 athena.ns.cloudflare.com
 austin.ns.cloudflare.com
 ben.ns.cloudflare.com
+bella.ns.cloudflare.com
 bob.ns.cloudflare.com
 chan.ns.cloudflare.com
 cody.ns.cloudflare.com
 darwin.ns.cloudflare.com
 dee.ns.cloudflare.com
+dom.ns.cloudflare.com
 dina.ns.cloudflare.com
 drew.ns.cloudflare.com
 ed.ns.cloudflare.com
@@ -41,11 +43,13 @@ leia.ns.cloudflare.com
 lex.ns.cloudflare.com
 matt.ns.cloudflare.com
 melinda.ns.cloudflare.com
+newt.ns.cloudflare.com
 nina.ns.cloudflare.com
 norm.ns.cloudflare.com
 pam.ns.cloudflare.com
 paul.ns.cloudflare.com
 pete.ns.cloudflare.com
+rachel.ns.cloudflare.com
 rick.ns.cloudflare.com
 rob.ns.cloudflare.com
 rose.ns.cloudflare.com
diff --git a/instructions.md b/instructions.md
index abb2e8a11..0cca6b1f1 100644
--- a/instructions.md
+++ b/instructions.md
@@ -18,8 +18,26 @@
 
 1) How to detect Cloudflare
 
+There are many ways to detect it:
+
 - [These add-ons](what-to-do.md) will help your Cloudflare collection.
 - Visit a website via Tor or VPN, and you will be greeted by "Attention Required! Cloudflare" webpage.
+- Dig "[NS record](https://www.digwebinterface.com/?hostnames=emsisoft.com&type=NS&ns=resolver&useresolver=8.8.4.4&nameservers=)" of the domain.
+
+```
+emsisoft.com.		21599	IN	NS	bella.ns.cloudflare.com.
+emsisoft.com.		21599	IN	NS	dom.ns.cloudflare.com.
+```
+
+- Dig "[A record](https://www.digwebinterface.com/?hostnames=dev.qubes-os.org&type=A&ns=resolver&useresolver=8.8.4.4&nameservers=)" of the FQDN, then [check the IP's owner](https://ipinfo.io/104.18.228.122).
+
+```
+dev.qubes-os.org.	299	IN	A	104.18.228.122
+
+ASN AS13335 Cloudflare, Inc.
+Organization Cloudflare, Inc.
+Route 104.18.224.0/20
+```
 
 2) How to add your data