diff --git a/public/css/style.scss b/public/css/style.scss
index ae2515092..cdd8434e9 100644
--- a/public/css/style.scss
+++ b/public/css/style.scss
@@ -474,12 +474,17 @@ a:hover {
     padding: 2rem;
     display: grid;
     gap: 1rem;
-    width: 300px;
+    width: 400px;
 
     .title {
       font-size: 1.5rem;
       color: var(--sub-color);
     }
+
+    .tip{
+      font-size: .75rem;
+      color: var(--sub-color);
+    }
   }
 }
 
diff --git a/public/index.html b/public/index.html
index 9a7f4e25a..4046ac24d 100644
--- a/public/index.html
+++ b/public/index.html
@@ -91,6 +91,7 @@
       <div id="customMode2Popup" mode="">
         <div class="title">Test length</div>
         <input type="number" value="1" min="1" max="10000" />
+        <div class="tip">You can start an infinite test by inputting 0. Then, to stop the test, use the Bail Out feature (esc > Bail Out)</div>
         <div class="button">ok</div>
       </div>
     </div>