diff --git a/index.html b/index.html
index 3499fa1..2e0ed96 100644
--- a/index.html
+++ b/index.html
@@ -238,7 +238,7 @@
     <div class="graphicSlider">
      <p class="sign-left">-</p>
      <div class="range">
-     <input id="range1" oninput="showPhrase(this.value)" type="range" min="0" max="6" value="0" steps="1" aria-label="range for general ambient background noise">
+     <input id="range1" oninput="showPhrase(this.value)" type="range" min="0" max="6" value="0" steps="1" aria-label="range for general ambient background noise" aria-valuemax="6" aria-valuemin="0" aria-valuenow="0">
      </div>
      <p class="sign-right">+</p>
     </div>