-mouse, PuTTY will select a sequence of whole words. If you
-\e{triple}-click, or triple-click and drag, then PuTTY will select a
-whole line or sequence of lines.
+mouse, PuTTY will select a sequence of whole words. (You can adjust
+precisely what PuTTY considers to be part of a word; see
+\k{config-charclasses}.) If you \e{triple}-click, or triple-click
+and drag, then PuTTY will select a whole line or sequence of lines.