`magenta`, `cyan` and `white`; the attributes are `bold`, `dim`, `ul`,
`blink` and `reverse`. The first color given is the foreground; the
second is the background. The position of the attribute, if any,
-doesn't matter.
+doesn't matter. Attributes may be turned off specifically by prefixing
+them with `no` (e.g., `noreverse`, `noul`, etc).
++
+Colors (foreground and background) may also be given as numbers between
+0 and 255; these use ANSI 256-color mode (but note that not all
+terminals may support this). If your terminal supports it, you may also
+specify 24-bit RGB values as hex, like `#ff0ab3`.
color.diff::
Whether to use ANSI escape sequences to add color to patches.