diff --git a/Optional-Hardening.md b/Optional-Hardening.md
index 4f63361..b2e0f55 100644
--- a/Optional-Hardening.md
+++ b/Optional-Hardening.md
@@ -94,7 +94,7 @@ If you disable captive portals on a **mobile** device, then you'll need a separa
 
 ```javascript
 // PREF: disable captive portal detection
-// [WARNING] Do NOT use for mobile devices
+// [WARNING] Do NOT use for mobile devices!
 // You may NOT be able to use Firefox on public wifi
 user_pref("captivedetect.canonicalURL", ""); 
 user_pref("network.captive-portal-service.enabled", false);