diff --git a/Usage.md b/Usage.md
index fe95cde..c71dd94 100644
--- a/Usage.md
+++ b/Usage.md
@@ -100,7 +100,7 @@ Use plugin `nbak` to backup configuration.
 | `NO_COLOR=1` <sup>9</sup> | disable ANSI color output |
 
 1. Key-bookmark and key-plugin pairs are listed in the help and config screen (key <kbd>?</kbd>).
-2. Sort keys can be a/d/e/s/t/v (see option -T). Capitalize to reverse. Path must be absolute.
+2. Sort keys can be `a`/`d`/`e`/`r`/`s`/`t`/`v` (see program option `-T`). Capitalize to reverse (except `r`). Path must be absolute.
 3. With `atool` or `bsdtar` and `(un)rar` installed you can have:
 
        export NNN_ARCHIVE="\\.(7z|a|ace|alz|arc|arj|bz|bz2|cab|cpio|deb|gz|jar|lha|lz|lzh|lzma|lzo|rar|rpm|rz|t7z|tar|tbz|tbz2|tgz|tlz|txz|tZ|tzo|war|xpi|xz|Z|zip)$"