Lark doc: explained why parameters C and D do not appear as chaos mod…

…e options.

Lark.md

@@ -75,6 +75,8 @@ Each animal name starts with the same letter as the Dequan Li parameter being co
 * Ferret for $F$.
 * Kangaroo for $K$.
 
+(The parameters $C$ and $D$ do not appear as chaos mode options because I discovered they did not produce sufficiently interesting or different behavior from the other parameters.)
+
 You can change the chaos mode by right-clicking on the CHAOS knob and selecting one of the chaos mode options:
 
 ![Lark CHAOS button context menu](images/lark_chaos_menu.png)