Update basis_spec.txt
diff --git a/spec/basis_spec.txt b/spec/basis_spec.txt
index da9ffb5..95bab7a 100644
--- a/spec/basis_spec.txt
+++ b/spec/basis_spec.txt
@@ -386,7 +386,7 @@
codebooks are used. Hybrid codebooks are not supported either, so this bit
should always be 0.
-The third bit indicates of the selector codebook has been sent in raw form
+The third bit indicates if the selector codebook has been sent in raw form
(uncompressed). If it's set, each selector is sent as four 8-bit bytes. Each
byte corresponds to four 2-bit ETC1S selectors. The first selector of each group
of 4 selectors starts at the LSB (least significant bit) of each byte, and is
@@ -396,7 +396,8 @@
The "delta_selector_pal_model" Huffman table will immediately follow the third
bit, and is stored using the procedure outlined in section 6.0.
-Here is the DPCM decoding procedure for selector codebooks:
+Immediately following the Huffman table is the compressed selector codebook.
+Here is the DPCM decoding procedure:
uint8_t prev_bytes[4] = { 0, 0, 0, 0 };
