diff --git a/const-PARAMETERS.md b/const-PARAMETERS.md
index 115c9f3..f3771aa 100644
--- a/const-PARAMETERS.md
+++ b/const-PARAMETERS.md
@@ -119,7 +119,7 @@ Parameter Name | Required | Type | Supported values | Description
 ---------------|----------|------|------------------| -----------
 `name` | **yes** | Text | | Input name as displayed to the user
 `type` | no | Text | `text`, `number`, `list`, `checkbox` | Type of the input (default: `text`)
-`required` | no | Boolean | `true`, `false` | Specifies if the parameter is required or not (default: `false`)
+`required` | no | Boolean | `true`, `false` | Specifies if the parameter is required or not (default: `false`). Not supported for lists and checkboxes.
 [`values`](#list-values) | no | associative array | | name/value pairs used by the HTML option tag, required for type '`list`'
 `title` | no | Text | | Used as tool-tip when mouse-hovering over the input box
 `pattern` | no | Text | | Defines a pattern for an element of type `text`. The pattern should be mentioned in the `title` attribute!