docs: add notes about escaping

README.md

@@ -11,6 +11,8 @@ Usage
 npm install glob-parent --save
 ```
 
+**Examples**
+
 ```js
 var globParent = require('glob-parent');
 
@@ -31,7 +33,22 @@ globParent('path/**/*'); // 'path'
 globParent('path/foo/bar.js'); // 'path/foo'
 globParent('path/foo/'); // 'path/foo'
 globParent('path/foo'); // 'path' (see issue #3 for details)
+```
+
+## Escaping
+
+The following characters have special significance in glob patterns and must be escaped if you want them to be treated as regular path characters:
 
+- `?` (question mark)
+- `*` (star)
+- `[` (opening bracket)
+- `]` (closing bracket)
+
+**Example**
+
+```js
+globParent('foo/[bar]/') // 'foo'
+globParent('foo/\\[bar]/') // 'foo/\\[bar]'
 ```
 
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