diff --git a/changelog.txt b/changelog.txt
index 884d24116db638f5dafcea028b661ebd754e7bcc..327a3dd91fef2d5f1dc779ad8e467e99a30c7b26 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -1,5 +1,12 @@
 # Changelog
 
+## [3.1.1] - 2023-03-16
+### Added
+- WPEditorField
+### Deprecated
+- WyswigField
+### Fixed
+
 ## [3.1.0] - 2022-08-30
 ### Added
 - de_DE translations
diff --git a/src/Field/CheckboxField.php b/src/Field/CheckboxField.php
index 101bc60099e2a2cb8c27d8adecbd4f8bc8f6025e..14110296cb1f03405c8928913d9fd1a6ac1b4a00 100644
--- a/src/Field/CheckboxField.php
+++ b/src/Field/CheckboxField.php
@@ -6,6 +6,9 @@ use WPDesk\Forms\Field;
 
 class CheckboxField extends BasicField {
 
+	const VALUE_TRUE  = 'yes';
+	const VALUE_FALSE = 'no';
+
 	public function get_type(): string {
 		return 'checkbox';
 	}