Update article.md

Since there are mentioned other things explained in less detail (as Bitwise operators), could be useful to have this explained here.

Author: maurodibert

1-js/02-first-steps/16-javascript-specials/article.md

@@ -149,7 +149,7 @@ Ternary
 : The only operator with three parameters: `cond ? resultA : resultB`. If `cond` is truthy, returns `resultA`, otherwise `resultB`.
 
 Logical operators
-: Logical AND `&&` and OR `||` perform short-circuit evaluation and then return the value where it stopped.
+: Logical AND `&&` and OR `||` perform short-circuit evaluation and then return the value where it stopped. Logical NOT `!` converts the operand to boolean type and returns the inverse value.
 
 Comparisons
 : Equality check `==` for values of different types converts them to a number (except `null` and `undefined` that equal each other and nothing else), so these are equal: