diff --git a/docs/ftldns/blockingmode.md b/docs/ftldns/blockingmode.md
index 266d470..2de543d 100644
--- a/docs/ftldns/blockingmode.md
+++ b/docs/ftldns/blockingmode.md
@@ -38,6 +38,9 @@ Following [RFC 3513, Internet Protocol Version 6 (IPv6) Addressing Architecture,
 
 ## Pi-hole's IP (IPv6 NODATA) blocking
 
+!!! warning
+    The block page can only be displayed for unencrypted `http` connections. Since the majority of web pages today are accessed over encrypted `https` connections, no block page will be displayed. This option may be removed in the future.
+
 `/etc/pihole/pihole-FTL.conf` setting:
 
 ```
@@ -66,6 +69,9 @@ doubleclick.net.        2       IN      A       192.168.2.11
 
 ## Pi-hole's full IP blocking
 
+!!! warning
+    The block page can only be displayed for unencrypted `http` connections. Since the majority of web pages today are accessed over encrypted `https` connections, no block page will be displayed. This option may be removed in the future.
+
 `/etc/pihole/pihole-FTL.conf` setting:
 
 ```