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chrome/common/extensions/api/tts.json

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 [
   {
     "namespace": "tts",
+    "description": "Use the <code>chrome.tts</code> module to play synthesized text-to-speech (TTS). See also the related <a href='http://developer.chrome.com/extensions/ttsEngine.html'>ttsEngine</a> module, which allows an extension to implement a speech engine.",
     "types": [
       {
         "id": "TtsEvent",
         "type": "object",
         "description": "An event from the TTS engine to communicate the status of an utterance.",
         "properties": {
           "type": {
             "type": "string",
             "enum": ["start", "end", "word", "sentence", "marker", "interrupted", "cancelled", "error", "pause", "resume"],
             "description": "The type can be 'start' as soon as speech has started, 'word' when a word boundary is reached, 'sentence' when a sentence boundary is reached, 'marker' when an SSML mark element is reached, 'end' when the end of the utterance is reached, 'interrupted' when the utterance is stopped or interrupted before reaching the end, 'cancelled' when it's removed from the queue before ever being synthesized, or 'error' when any other error occurs. When pausing speech, a 'pause' event is fired if a particular utterance is paused in the middle, and 'resume' if an utterance resumes speech. Note that pause and resume events may not fire if speech is paused in-between utterances."
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             "name": "event",
             "$ref": "TtsEvent",
             "description": "The event from the text-to-speech engine indicating the status of this utterance."
           }
         ],
         "description": "Used to pass events back to the function calling speak()."
       }
     ]
   }
 ]