More precision in defining string literals

draft-ietf-quic-qpack.md

@@ -652,15 +652,17 @@ This string format includes optional Huffman encoding.
 
 HPACK defines string literals to begin on a byte boundary.  They begin with a
 single bit flag, denoted as 'H' in this document (indicating whether the string
-is Huffman-coded), followed by the Length encoded as a 7-bit prefix integer,
-and finally Length bytes of data. When Huffman encoding is enabled, the Huffman
-table from Appendix B of [RFC7541] is used without modification.
+is Huffman-coded), followed by the Length encoded as a 7-bit prefix integer, and
+finally Length bytes of data. When Huffman encoding is enabled, the Huffman
+table from Appendix B of [RFC7541] is used without modification and Length
+indicates the size of the string after encoding.
 
 This document expands the definition of string literals by permitting them to
 begin other than on a byte boundary.  An "N-bit prefix string literal" begins
-with the same Huffman flag, followed by the length encoded as an (N-1)-bit
-prefix integer.  The prefix size, N, can have a value between 2 and 8 inclusive.
-The remainder of the string literal is unmodified.
+mid-byte, with the first (8-N) bits allocated to a previous field. The string
+uses one bit for the Huffman flag, followed by the Length encoded as an
+(N-1)-bit prefix integer.  The prefix size, N, can have a value between 2 and 8
+inclusive. The remainder of the string literal is unmodified.
 
 A string literal without a prefix length noted is an 8-bit prefix string literal
 and follows the definitions in [RFC7541] without modification.