-\fB--compress\fR=\fITYPE\fR
-Specifies the compression type for the new WIM file. This flag is only valid
-for \fB@IMAGEX_PROGNAME@ capture\fR, since the compression mode for
-\fB@IMAGEX_PROGNAME@ append\fR must be the same as that of the existing
-WIM (and is automatically set as such). \fITYPE\fR may be "none",
-"fast", or "maximum". As of wimlib v1.5.3, the default is LZX compression, but
-in a special mode that is somewhere in between "fast" and "maximum" in terms of
-speed and compression ratio. Use \fB--compress\fR=\fImaximum\fR to explicitly
-request a better compression ratio at the cost of more time spent compressing.
-.IP ""
-You may also specify the actual names of the compression algorithms, "XPRESS"
-and "LZX", instead of "fast" and "maximum", respectively.
-.IP ""
-As of wimlib v1.6.0, a third compression type, "recovery" or "LZMS", is also
-available. Its use is generally not recommended because other than wimlib
-itself, it is only compatible with WIMGAPI Windows 8 and later, and DISM Windows
-8.1 and later. However, LZMS is the compression algorithm used by default in
-packed resources created if the \fB--pack-streams\fR option is specified.
-.TP
-\fB--compress-slow\fR
-Spend even more time compressing the data to achieve a very slightly better
-compression ratio. This currently only has an effect for LZX ("maximum", the
-default) and LZMS ("recovery") compression.
+\fB--compress\fR=\fITYPE\fR[:\fILEVEL\fR]
+Specifies the compression format for the new WIM file. \fITYPE\fR may be
+"none", "XPRESS" (alias: "fast"), "LZX" (alias: "maximum"), or "LZMS" (alias:
+"recovery"). \fITYPE\fR is matched case-insensitively. The default is "LZX".
+.IP ""
+You can optionally also specify an integer compression \fILEVEL\fR. The
+compression level specifies how hard the compression algorithm for the specified
+compression \fITYPE\fR will work to compress the data. The values are scaled so
+that 20 is quick compression, 50 is medium compression, and 100 is high
+compression. However, you can choose any value, and not just these particular
+values. The default is 50.
+.IP ""
+Be careful if you choose LZMS compression. It is not compatible with wimlib
+before v1.6.0, WIMGAPI before Windows 8, DISM before Windows 8.1, and 7-Zip.