Thanks to Denis Excoffier.
.IP \(bu 3
If 40\ % of RAM is at least 80 MiB, 40\ % of RAM is used as the limit.
.IP \(bu 3
-If 80\ % of RAM is over 80 MiB, 80 MiB is used as the limit.
+If 80\ % of RAM is less than 80 MiB, 80\ % of RAM is used as the limit.
.IP \(bu 3
-Otherwise 80\ % of RAM is used as the limit.
+Otherwise 80 MiB is used as the limit.
.PP
When compressing, if the selected compression settings exceed the memory
usage limit, the settings are automatically adjusted downwards and a notice