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docs: clarify --fast level bounds and selection #4844

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5 changes: 5 additions & 0 deletions programs/zstd.1.md
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Expand Up @@ -121,8 +121,13 @@ the last one takes effect.
* `--fast[=#]`:
switch to ultra-fast compression levels.
If `=#` is not present, it defaults to `1`.
`#` must be a positive integer. Values above the maximum supported by the
linked library (`-ZSTD_minCLevel()`, currently 131072) are clamped to that
maximum.
The higher the value, the faster the compression speed,
at the cost of some compression ratio.
Start with `--fast=1` or `--fast=4` and benchmark on your own data before
choosing a higher value; the speed and ratio trade-off depends on the input.
This setting overwrites compression level if one was set previously.
Similarly, if a compression level is set after `--fast`, it overrides it.
* `-T#`, `--threads=#`:
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