diff --git a/popup/popup.css b/popup/popup.css
index 9994022..e393bcb 100644
--- a/popup/popup.css
+++ b/popup/popup.css
@@ -76,6 +76,17 @@ textarea {
     min-height: 90px;
 }
 
+label a {
+    font-size: 0.95rem;
+    text-decoration: none;
+    color: white;
+    font-style: italic;
+}
+
+label a:hover {
+    text-decoration: underline;
+}
+
 .button-container {
     display: flex;
     justify-content: center;
diff --git a/popup/popup.html b/popup/popup.html
index b53dedd..b57d9d3 100644
--- a/popup/popup.html
+++ b/popup/popup.html
@@ -58,10 +58,18 @@
             <input id="check-interval" value="" type="number" min="200" step="100">
         </div>
         <div>
-            <label for="ban-domain" title="Require page refresh to take affect">
-                Ban domains
+            <label for="ban-domain">
+                Ban terms -
+                <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions" target="_blank">
+                    JS regex accepted &#9432;
+                </a>
             </label>
-            <textarea id="ban-domain" placeholder="Enter ban domains, separated by newlines" rows="5"></textarea>
+            <textarea
+                id="ban-domain"
+                placeholder="Enter ban terms, each on one line. JavaScript regex is accepted. Matching is case insensitive."
+                rows="5"
+            >
+            </textarea>
         </div>
         <div class="button-container">
             <button id="basic-btn"><span>&#171;</span> Basic</button>
diff --git a/scripts/clean-spams.js b/scripts/clean-spams.js
index 7b61b60..57cc87c 100644
--- a/scripts/clean-spams.js
+++ b/scripts/clean-spams.js
@@ -8,7 +8,7 @@ function containBanDomain(node, banDomains) {
       if (text.match(regex)) {
         return true;
       }
-    } else if (text.includes(domain)) {
+    } else if (text.includes(domain.toLowerCase())) {
       return true;
     }
   }