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+<!--
+@license
+Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
+This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
+The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+Code distributed by Google as part of the polymer project is also
+subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+-->
+
+<link rel="import" href="../polymer/polymer.html">
+
+<script>
+
+  /**
+   * Use `Polymer.PaperInputAddonBehavior` to implement an add-on for `<paper-input-container>`. A
+   * add-on appears below the input, and may display information based on the input value and
+   * validity such as a character counter or an error message.
+   * @polymerBehavior
+   */
+  Polymer.PaperInputAddonBehavior = {
+
+    hostAttributes: {
+      'add-on': ''
+    },
+
+    attached: function() {
+      this.fire('addon-attached');
+    },
+
+    /**
+     * The function called by `<paper-input-container>` when the input value or validity changes.
+     * @param {{
+     *   inputElement: (Element|undefined),
+     *   value: (string|undefined),
+     *   invalid: boolean
+     * }} state -
+     *     inputElement: The input element.
+     *     value: The input value.
+     *     invalid: True if the input value is invalid.
+     */
+    update: function(state) {
+    }
+
+  };
+
+</script>