diff --git a/core/modules/widgets/checkbox.js b/core/modules/widgets/checkbox.js
index 6ed7a7a5c..9fa1c4889 100644
--- a/core/modules/widgets/checkbox.js
+++ b/core/modules/widgets/checkbox.js
@@ -156,6 +156,9 @@ CheckboxWidget.prototype.handleChangeEvent = function(event) {
 	if(this.checkboxActions) {
 		this.invokeActionString(this.checkboxActions,this,event);
 	}
+	if(this.checkboxUncheckActions && !checked) {
+		this.invokeActionString(this.checkboxUncheckActions,this,event);
+	}
 };
 
 /*
@@ -164,6 +167,7 @@ Compute the internal state of the widget
 CheckboxWidget.prototype.execute = function() {
 	// Get the parameters from the attributes
 	this.checkboxActions = this.getAttribute("actions");
+	this.checkboxUncheckActions = this.getAttribute("uncheckactions");
 	this.checkboxTitle = this.getAttribute("tiddler",this.getVariable("currentTiddler"));
 	this.checkboxTag = this.getAttribute("tag");
 	this.checkboxField = this.getAttribute("field");
@@ -197,4 +201,4 @@ CheckboxWidget.prototype.refresh = function(changedTiddlers) {
 
 exports.checkbox = CheckboxWidget;
 
-})();
\ No newline at end of file
+})();
diff --git a/editions/tw5.com/tiddlers/widgets/CheckboxWidget.tid b/editions/tw5.com/tiddlers/widgets/CheckboxWidget.tid
index 5165bde90..60f1b389b 100644
--- a/editions/tw5.com/tiddlers/widgets/CheckboxWidget.tid
+++ b/editions/tw5.com/tiddlers/widgets/CheckboxWidget.tid
@@ -26,7 +26,8 @@ The content of the `<$checkbox>` widget is displayed within an HTML `<label>` el
 |unchecked |The value of the field corresponding to the checkbox being unchecked |
 |default |The default value to use if the field is not defined |
 |class |The class that will be assigned to the label element |
-|actions |<<.from-version "5.1.14">> A string containing ActionWidgets to be triggered when the checkbox is clicked |
+|actions |<<.from-version "5.1.14">> A string containing ActionWidgets to be triggered when the checkbox is checked |
+|uncheckactions |<<.from-version "5.1.16">> A string containing ActionWidgets to be triggered when the checkbox is unchecked |
 
 !! Tag Mode