diff --git a/FAQ.md b/FAQ.md
index 51b6f4805b..437be40914 100644
--- a/FAQ.md
+++ b/FAQ.md
@@ -3721,7 +3721,8 @@ This feature requires an internet connection and is not available in the Play st
 
 A spam block list is basically a list of domain names which have been used to send spam or to spread malware.
 
-The domain name will be resolved into an IP address and after that the IP address will be looked up:
+A spam block list is checked by resolving the domain name of an email address into an IP address
+and looking up the IP address with a DNS request:
 
 ```
 example@gmail.com ->
@@ -3730,9 +3731,11 @@ gmail.com ->
 	172.217.168.229
 DNS lookup 229.168.217.172.zen.spamhaus.org ->
 	127.0.0.2: spam
-	not found: not spam
+	NXDOMAIN: not spam
 ```
 
+NXDOMAIN = no such domain
+
 For more information, please see [this article](https://en.wikipedia.org/wiki/Domain_Name_System-based_blackhole_list).
 
 FairEmail currently uses the following block lists: