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-rw-r--r--b3sum/README.md11
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diff --git a/b3sum/README.md b/b3sum/README.md
index 9f66a60..d1fbc21 100644
--- a/b3sum/README.md
+++ b/b3sum/README.md
@@ -11,17 +11,18 @@ Arguments:
[FILE]... Files to hash, or checkfiles to check
Options:
+ --keyed Use the keyed mode, reading the 32-byte key from stdin
+ --derive-key <CONTEXT> Use the key derivation mode, with the given context string
-l, --length <LEN> The number of output bytes, before hex encoding [default: 32]
+ --seek <SEEK> The starting output byte offset, before hex encoding [default: 0]
--num-threads <NUM> The maximum number of threads to use
- --keyed Use the keyed mode
- --derive-key <CONTEXT> Use the key derivation mode, with the given context string
--no-mmap Disable memory mapping
--no-names Omit filenames in the output
--raw Write raw output bytes to stdout, rather than hex
-c, --check Read BLAKE3 sums from the [FILE]s and check them
- --quiet Skip printing OK for each successfully verified file
- -h, --help Print help information (use `--help` for more detail)
- -V, --version Print version information
+ --quiet Skip printing OK for each checked file
+ -h, --help Print help (see more with '--help')
+ -V, --version Print version
```
See also [this document about how the `--check` flag