bracket expression details

concepts/quoting/introduction.md

@@ -132,9 +132,11 @@ The glob wildcard characters are:
    </summary>
 
     * `[abc]` matches exactly one character that is either an `a` or a `b` or a `c`.
+        * to include a literal close bracket in the expression, make it the first character after the opening bracket (after an optional `^`)
+            * `[][]` is a bracket expression that will match either a close or an open bracket.
     * `[x-y]` matches exactly one character that is in the _range_ from `x` to `y`
-        * to include a literal hyphen character in a character set, it must be either the first (after an optional `^`) or the last
-    * `[-xy]` or `[xy-]` each match exactly one character that is an `-` or a `x` or a `y`
+        * to include a literal hyphen character in a character set, it must be either the first character after the opening bracket (after an optional `^`) or the last character before the closing bracket.
+            * `[-xy]` or `[xy-]` each match exactly one character that is an `-` or a `x` or a `y`
         * multiple ranges can be specified, for example `[0-9A-Fa-f]` matches a hexadecimal digit
     * `[^abc]` matches exactly one character that is **NOT** an `a` or a `b` or a `c`,
     * `[^x-y]` matches exactly one character that is **NOT** in the range from `x` to `y`