diff --git a/README.md b/README.md
index d1ab7a2..3eacda7 100644
--- a/README.md
+++ b/README.md
@@ -153,9 +153,12 @@ let ok = await confirm("Are you sure ?");
 ### Closing dialogs
 
 Your dialog must define a `returnValue` function. You may do so either in the setup function using Composition API or as
-a method using Options API. To close the dialog, call `closeDialog()`. When you do so, the promise will resolve to the
+a method using Options API. To close the dialog, call `resolveDialog()`. When you do so, the promise will resolve to the
 result of the `returnValue` function. You may also resolve the promise to something else (for example null) by passing a
-value to `closeDialog()`.
+value to `resolveDialog()`. 
+
+Alertnatively, you can call `rejectDialog()`. This will throw a `DismissedDialog` error (you can also pass your own error as an argument),
+meaning your promise won't be resolved, but rejected. As a result, the dialog will be closed as well.
 
 ### Typescript
 
@@ -178,8 +181,8 @@ for the centered div. It has one slot which is the content of the centered div.
 The OkCancelBox.vue component is a Box that serves as base for all dialogs that include OK and CANCEL buttons. It has
 two slots : `header` and `body`. Body is where the controls of the dialog reside. It has a `valid` prop. If `valid` is
 false, the OK button is disabled. The whole thing is included into a `form` tag so that hitting enter when a control has
-focus triggers a click on the OK button. When OK is clicked, `closeDialog` is called.
-When CANCEL is clicked, `closeDialog` is called with a null return value.
+focus triggers a click on the OK button. When OK is clicked, `resolveDialog` is called.
+When CANCEL is clicked, `resolveDialog` is called with a null return value.
 
 ### ConfirmDialog.vue
 
@@ -189,4 +192,4 @@ resolves to true if the user clicks OK and to null if the use clicks CANCEL.
 ### TextDialog.vue
 
 A TextBox is an OkCancelBox with a text field and a `returnValue` function that returns the content of the text field.
-If the text field is empty, the valid prop is set to false on OkCancelBox.
\ No newline at end of file
+If the text field is empty, the valid prop is set to false on OkCancelBox.
diff --git a/lib/index.ts b/lib/index.ts
index 7c6f62d..a708589 100644
--- a/lib/index.ts
+++ b/lib/index.ts
@@ -1,9 +1,11 @@
 import DialogWrapper from "./components/DialogWrapper.vue"
-import {openDialog, closeDialog, PromiseDialog} from "./ts/lib";
+import {openDialog, closeDialog, resolveDialog, rejectDialog, PromiseDialog} from "./ts/lib";
 
 export {
     DialogWrapper,
     PromiseDialog,
     openDialog,
-    closeDialog
+    closeDialog,
+    resolveDialog,
+    rejectDialog
 }
diff --git a/lib/ts/lib.ts b/lib/ts/lib.ts
index b4a51bf..c70a4b4 100644
--- a/lib/ts/lib.ts
+++ b/lib/ts/lib.ts
@@ -7,15 +7,18 @@ export interface DialogInstance {
     wrapper: string;
     props: any;
     resolve: (data: any) => void;
+    reject: (err: Error) => void;
 }
 
+export class DismissedDialog extends Error {}
+
 export const dialogRef = shallowRef<DialogInstance>();
 
 /**
  * Closes the currently opened dialog, resolving the promise with the return value of the dialog, or with the given
  * data if any.
  */
-export function closeDialog(data?: any) {
+export function resolveDialog(data?: any): void {
     if (data === undefined) {
         data = dialogRef.value.comp.returnValue();
     }
@@ -23,6 +26,27 @@ export function closeDialog(data?: any) {
     dialogRef.value = null;
 }
 
+/**
+ * Closes the currently opened dialog, rejecting the promise with a DismissedDialog error, or with the given
+ * error if any.
+ */
+export function rejectDialog(err?: Error): void {
+    dialogRef.value.reject(err ?? new DismissedDialog('Dialog was dismissed.'));
+    dialogRef.value = null;
+}
+
+/**
+ * This is kept for backward compatility. Call either `resolveDialog()` or `rejectDialog()` instead.
+ * @deprecated
+ */
+export function closeDialog(data?: any): void {
+    if (data instanceof Error) {
+        rejectDialog(data);
+    } else {
+        resolveDialog(data);
+    }
+}
+
 /**
  * Extracts the type of props from a component definition.
  */
@@ -55,12 +79,13 @@ type ReturnType<C extends DefineComponent<any, any, any, any, any>> = BindingRet
  * @return A promise that resolves when the dialog is closed
  */
 export function openDialog<C extends DefineComponent<any, any, any, any, any>>(dialog: C, props?: PropsType<C>, wrapper: string = 'default'): Promise<ReturnType<C>> {
-    return new Promise(resolve => {
+    return new Promise((resolve, reject) => {
         dialogRef.value = {
             dialog,
             props,
             wrapper,
-            resolve
+            resolve,
+            reject
         }
     });
 }