diff --git a/README.md b/README.md
index da035ab..67c6c62 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,5 @@
+# This package is deprecated. Use [esptool-js](https://github.com/espressif/esptool-js/) instead.
+
 # ESP Web Flasher
 
 JavaScript package to install firmware on ESP devices via the browser using WebSerial.
diff --git a/css/dark.css b/css/dark.css
index ec0ae9c..b2cf609 100644
--- a/css/dark.css
+++ b/css/dark.css
@@ -45,7 +45,7 @@ input, select, button {
   color: #333;
 }
 
-#notSupported {
+.notSupported, .notSupported a {
   background-color: red;
   color: white;
 }
diff --git a/css/light.css b/css/light.css
index 426d82d..6babb39 100644
--- a/css/light.css
+++ b/css/light.css
@@ -13,7 +13,7 @@ input, select, button {
   color: #000;
 }
 
-#notSupported {
+.notSupported, .notSupported a {
   background-color: red;
   color: white;
 }
@@ -76,4 +76,4 @@ input, select, button {
 
 .progress-bar {
   border-color: #333;
-}
\ No newline at end of file
+}
diff --git a/index.html b/index.html
index 4b8fa01..01f6432 100644
--- a/index.html
+++ b/index.html
@@ -53,6 +53,12 @@
       </div>
     </header>
     <main class="main">
+      <div class="notSupported">
+        This website is no longer maintained.
+        <a href="https://espressif.github.io/esptool-js/"
+          >Use esptool-js instead.</a
+        >
+      </div>
       <div id="notSupported" class="notSupported">
         Sorry, <b>Web Serial</b> is not supported on this device, make sure
         you're running Chrome 89 or later.