Minor fixes for interleaved .vag loop points

README.md

@@ -80,17 +80,16 @@ Notes:
   [.vag header](https://psx-spx.consoledev.net/cdromfileformats/#cdrom-file-audio-single-samples-vag-sony)
   at the beginning of the file. The header is always 48 bytes long for `vag`
   files, while in the case of `vagi` files it is padded to the size specified
-  using the `-a` option (2048 bytes by default).
-
-- The `vagi` format extends the standard .vag header by changing the signature
-  to `VAGi` and adding the following fields:
+  using the `-a` option (2048 bytes by default). The `vagi` format extends the
+  standard .vag header by adding the following fields:
   - the file's interleave size at offset `0x08-0x0B` (little endian);
   - the loop start offset in bytes-per-channel, if any, at offset `0x14-0x17`
     (little endian);
   - the file's channel count at offset `0x1E`.
 
-- The `spu`, `vag`, `spui` and `vagi` formats support setting a loop start
-  point. If the input file is either a .wav file with sampler metadata (`smpl`
+- The `spu` and `vag` formats support encoding a loop point as part of the ADPCM
+  data, while `vagi` supports storing one in the header for use by the stream
+  driver. If the input file is either a .wav file with sampler metadata (`smpl`
   chunk) or in a format FFmpeg supports parsing cue/chapter markers from, the
   first marker will be used as the loop point by default. The `-l` and `-n`
   options can be used to manually set a loop point or ignore the one present in