Updated documentation

doc/API.md

@@ -106,6 +106,7 @@ Audio API.
 | `array_buffer`    | [`ArrayBuffer`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/ArrayBuffer) | Contains encoded audio. If using this option, an `audio_context` is also required |
 | `audio_buffer`    | [`AudioBuffer`](https://developer.mozilla.org/en-US/docs/Web/API/AudioBuffer)                                 | Contains decoded audio. If using this option, an `audio_context` is not required |
 | `scale`           | Number (integer, default: `512`)                                                                              | Controls the resolution of the waveform data by specifying the number of input audio samples per output waveform data point |
+| `bits`            | Number (integer, default: `8`)                                                                                | Sets the number of bits to use for output waveform data points. Valid values are either `8` or `16`. |
 | `amplitude_scale` | Number (default: `1.0`)                                                                                       | Applies amplitude scaling to the waveform data. For example, set to `2.0` to double the waveform amplitude |
 | `split_channels`  | Boolean (default: `false`)                                                                                    | Set to `true` to produce separate waveform channels instead of combining all channels into a single waveform |
 | `disable_worker`  | Boolean (default: `false`)                                                                                    | Set to `true` to disable use of a [Web Worker](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Using_web_workers) |