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diff --git a/accessible/interfaces/nsIAccessibleTextChangeEvent.idl b/accessible/interfaces/nsIAccessibleTextChangeEvent.idl
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+++ b/accessible/interfaces/nsIAccessibleTextChangeEvent.idl
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsIAccessibleEvent.idl"
+
+/**
+ * Fired when an accessible's text changes.
+ */
+[scriptable, builtinclass, uuid(1fcc0dfa-93e6-48f4-bbd4-f80eb1d9f2e6)]
+interface nsIAccessibleTextChangeEvent : nsIAccessibleEvent
+{
+  /**
+   * Returns offset of changed text in accessible.
+   */
+  readonly attribute long start;
+
+  /**
+   * Returns length of changed text.
+   */
+  readonly attribute unsigned long length;
+
+  /**
+   * Returns true if text was inserted, otherwise false.
+   */
+  readonly attribute boolean isInserted;
+
+  /**
+   * The inserted or removed text
+   */
+  readonly attribute AString modifiedText;
+};