diff --git a/new DNS.md b/new DNS.md
index ae03527..e093367 100644
--- a/new DNS.md	
+++ b/new DNS.md	
@@ -26,3 +26,7 @@ nameserver 51.79.70.119
 ```
 
 And that's it!
+
+## Heads up
+
+DNS caching breaks improperly set-up captive portals such as those at the library or airport. Do not use on a mobile device!