diff --git a/public_html/wp-content/plugins/pattern-directory/includes/notifications.php b/public_html/wp-content/plugins/pattern-directory/includes/notifications.php
index e61fac045..ebd5c862e 100644
--- a/public_html/wp-content/plugins/pattern-directory/includes/notifications.php
+++ b/public_html/wp-content/plugins/pattern-directory/includes/notifications.php
@@ -8,11 +8,44 @@
 
 defined( 'WPINC' ) || die();
 
+/**
+ * The post meta key holding the moderator's message to the author, which is
+ * included in the "pattern unlisted" email.
+ */
+const UNLISTED_DETAIL_META = '_wporg_unlist_reason_detail';
+
 /**
  * Actions and filters.
  */
 add_action( 'wp_after_insert_post', __NAMESPACE__ . '\trigger_notifications', 20, 4 );
 add_action( 'wporg_unlist_pattern', __NAMESPACE__ . '\notify_pattern_flagged' );
+add_action( 'init', __NAMESPACE__ . '\register_unlisted_meta' );
+
+/**
+ * Register the post meta used to store the moderator's message to the author.
+ *
+ * Editable by anyone who can edit the pattern (i.e. moderators), so it can be
+ * set from the Unlist modal in the block editor and read back when sending the
+ * "pattern unlisted" email.
+ *
+ * @return void
+ */
+function register_unlisted_meta() {
+	register_post_meta(
+		PATTERN,
+		UNLISTED_DETAIL_META,
+		array(
+			'type'              => 'string',
+			'description'       => 'A message from the moderator, included in the email sent to the author when a pattern is unlisted.',
+			'single'            => true,
+			'show_in_rest'      => true,
+			'sanitize_callback' => 'sanitize_textarea_field',
+			'auth_callback'     => function( $allowed, $meta_key, $object_id ) {
+				return current_user_can( 'edit_post', $object_id );
+			},
+		)
+	);
+}
 
 /**
  * Fire off relevant notification when a post is finished updating.
@@ -211,6 +244,12 @@ function notify_pattern_unlisted( $post ) {
 		$reason = get_default_reason_description();
 	}
 
+	// Append the moderator's message to the author, if one was provided.
+	$detail = get_post_meta( $post->ID, UNLISTED_DETAIL_META, true );
+	if ( $detail ) {
+		$reason .= "\n\n" . $detail;
+	}
+
 	$subject = esc_html__( 'Pattern unlisted', 'wporg-patterns' );
 
 	$message = sprintf(
diff --git a/public_html/wp-content/plugins/pattern-directory/src/pattern-post-type/details.js b/public_html/wp-content/plugins/pattern-directory/src/pattern-post-type/details.js
index 7c9a923f4..333a7f4e6 100644
--- a/public_html/wp-content/plugins/pattern-directory/src/pattern-post-type/details.js
+++ b/public_html/wp-content/plugins/pattern-directory/src/pattern-post-type/details.js
@@ -2,10 +2,17 @@
  * WordPress dependencies
  */
 import { __ } from '@wordpress/i18n';
-import { PluginDocumentSettingPanel } from '@wordpress/edit-post';
 import { ComboboxControl, FormTokenField, TextControl, TextareaControl } from '@wordpress/components';
 import { useDispatch, useSelect } from '@wordpress/data';
-import { store as editorStore } from '@wordpress/editor';
+// `PluginDocumentSettingPanel` moved from `@wordpress/edit-post` to `@wordpress/editor`.
+// Import from both and use whichever the running WordPress version provides.
+import {
+	PluginDocumentSettingPanel as PluginDocumentSettingPanelFromEditor,
+	store as editorStore,
+} from '@wordpress/editor';
+import { PluginDocumentSettingPanel as PluginDocumentSettingPanelFromEditPost } from '@wordpress/edit-post';
+
+const PluginDocumentSettingPanel = PluginDocumentSettingPanelFromEditor || PluginDocumentSettingPanelFromEditPost;
 
 const KEYWORD_SLUG = 'wpop_keywords';
 const DESCRIPTION_SLUG = 'wpop_description';
diff --git a/public_html/wp-content/plugins/pattern-directory/src/pattern-post-type/unlist-button/index.js b/public_html/wp-content/plugins/pattern-directory/src/pattern-post-type/unlist-button/index.js
index 5ab72c2a1..087476063 100644
--- a/public_html/wp-content/plugins/pattern-directory/src/pattern-post-type/unlist-button/index.js
+++ b/public_html/wp-content/plugins/pattern-directory/src/pattern-post-type/unlist-button/index.js
@@ -2,9 +2,11 @@
  * WordPress dependencies
  */
 import { __ } from '@wordpress/i18n';
-import { PluginPostStatusInfo } from '@wordpress/edit-post';
 import { Button } from '@wordpress/components';
-import { store as editorStore } from '@wordpress/editor';
+// `PluginPostStatusInfo` moved from `@wordpress/edit-post` to `@wordpress/editor`.
+// Import from both and use whichever the running WordPress version provides.
+import { PluginPostStatusInfo as PluginPostStatusInfoFromEditor, store as editorStore } from '@wordpress/editor';
+import { PluginPostStatusInfo as PluginPostStatusInfoFromEditPost } from '@wordpress/edit-post';
 import { useDispatch, useSelect } from '@wordpress/data';
 import { useState } from '@wordpress/element';
 
@@ -15,6 +17,8 @@ import { UNLISTED_STATUS } from '../settings';
 import UnlistModal from './modal';
 import './unlist.scss';
 
+const PluginPostStatusInfo = PluginPostStatusInfoFromEditor || PluginPostStatusInfoFromEditPost;
+
 export const UnlistButton = () => {
 	const status = useSelect( ( select ) => {
 		const _post = select( editorStore ).getCurrentPost();
@@ -23,10 +27,11 @@ export const UnlistButton = () => {
 	const { editPost, savePost } = useDispatch( editorStore );
 	const [ showModal, setShowModal ] = useState( false );
 
-	const onSubmit = ( reasonId ) => {
+	const onSubmit = ( reasonId, details = '' ) => {
 		editPost( {
 			status: UNLISTED_STATUS,
 			'wporg-pattern-flag-reason': [ reasonId ],
+			meta: { _wporg_unlist_reason_detail: details },
 		} );
 		savePost();
 	};
diff --git a/public_html/wp-content/plugins/pattern-directory/src/pattern-post-type/unlist-button/modal.js b/public_html/wp-content/plugins/pattern-directory/src/pattern-post-type/unlist-button/modal.js
index e3838641c..80b34b8ec 100644
--- a/public_html/wp-content/plugins/pattern-directory/src/pattern-post-type/unlist-button/modal.js
+++ b/public_html/wp-content/plugins/pattern-directory/src/pattern-post-type/unlist-button/modal.js
@@ -74,7 +74,7 @@ const UnlistModal = ( { onClose, onSubmit } ) => {
 	}, [] );
 
 	const submittedText = __(
-		'The pattern has been unlisted, and your internal note has been saved.',
+		'The pattern has been unlisted, and the author has been notified by email.',
 		'wporg-patterns'
 	);
 
@@ -101,7 +101,7 @@ const UnlistModal = ( { onClose, onSubmit } ) => {
 			note: details ? `UNLISTED: ${ reason.label } — ${ details }` : `UNLISTED: ${ reason.label }`,
 			onSuccess: () => {
 				if ( 'function' === typeof onSubmit ) {
-					onSubmit( selectedOption );
+					onSubmit( selectedOption, details );
 				}
 				dispatch( { status: 'NOTE_RECIEVED' } );
 				speak( submittedText );
@@ -155,9 +155,9 @@ const UnlistModal = ( { onClose, onSubmit } ) => {
 							<Spinner />
 						) }
 						<TextareaControl
-							label={ __( 'Please provide internal details', 'wporg-patterns' ) }
+							label={ __( 'Message to the pattern author', 'wporg-patterns' ) }
 							help={ __(
-								'This note will only be seen by other admins and moderators.',
+								'This message will be emailed to the pattern author, along with the reason selected above.',
 								'wporg-patterns'
 							) }
 							value={ details }