bytebeat-render.js: add new TODO

js-programming/bytebeat-render.js

@@ -9,6 +9,8 @@
  * production purposes.
  *
  * TODO: Fix signed bytebeat and floatbeat
+ * TODO: Add support for arbitrary (1 <= integer <= 2^32 - 1, because of
+ * WAVE/RIFF format limitations) audio bit depth
  *
  * Author: Intel A80486DX2-66
  * License: Creative Commons Zero 1.0 Universal