Update README.md

README.md

@@ -77,6 +77,9 @@ It also supports the following [override tags](http://docs.aegisub.org/3.2/ASS_T
   * `{\ytchroma(intime, outtime)}` - copies converge over `intime` milliseconds at the start and disperse over `outtime` milliseconds at the end.
   * `{\ytchroma(offsetX, offsetY, intime, outtime)}` - the first copy starts at `offsetX` pixels to the left of and `offsetY` pixels above the subtitle position. (The last copy starts at the same distance in the opposite direction.) Both offsets can be negative.
   * `{\ytchroma(color1, color2..., alpha, offsetX, offsetY, intime, outtime)}` - replace the default red/green/blue by any number of custom colors. Both the colors and the alpha value should be specified in hexadecimal (`&H...&`).
+* `{\ytkt}` - YTSubConverter-specific tag for enabling advanced Karaoke Types. Warning: using these will result in large files that may require multiple upload attempts before YouTube will accept them.
+  * `{\ytktFade}`: Configure the subtitle to use fading karaoke ([example video](https://www.youtube.com/watch?v=nLMRAKeoif0)).
+  * `{\ytktGlitch}`: Configure the subtitle to use karaoke with glitching characters ([example video](https://www.youtube.com/watch?v=9_IKgqsnfco)). Works best with left-aligned text and invisible unsung lyrics (= transparent secondary color).
 
 Unsupported tags are ignored.