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diff --git a/c/tools/brotli.md b/c/tools/brotli.md
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--- a/c/tools/brotli.md
+++ b/c/tools/brotli.md
@@ -1,11 +1,13 @@
# NAME
-brotli(1) -- brotli, unbrotli - compress or decompress files
+brotli(1) -- brotli, brcat, unbrotli - compress or decompress files
# SYNOPSIS
`brotli` [*OPTION|FILE*]...
+`brcat` is equivalent to `brotli --decompress --concatenated --stdout`
+
`unbrotli` is equivalent to `brotli --decompress`
# DESCRIPTION
@@ -83,9 +85,15 @@ Conflicting or duplicate _options_ are not allowed.
`(pow(2, NUM) - 16)`; 0 lets compressor decide over the optimal value;
bigger windows size improve density; decoder might require up to window size
memory to operate
+* `-C B64`, `--comment=B64`:
+ set comment; argument is base64-decoded first;
+ when decoding: check stream comment;
+ when encoding: embed comment (fingerprint)
* `-D FILE`, `--dictionary=FILE`:
use FILE as raw (LZ77) dictionary; same dictionary MUST be used both for
compression and decompression
+* `-K`, `--concatenated`:
+ when decoding, allow concatenated brotli streams as input
* `-S SUF`, `--suffix=SUF`:
output file suffix (default: `.br`)
* `-V`, `--version`: