diff --git a/CHANGELOG.md b/CHANGELOG.md
index d906cf297ee81..48eba2d830cd2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -76,6 +76,7 @@
 - [debug] `DebugSession` and `PluginDebugSession` constructors accept a `parentSession` of type `DebugSession | undefined` as their 3rd parameter, offsetting every subsequent parameter by one [#9613](https://github.com/eclipse-theia/theia/pull/9613)
 - [monaco] upgraded to monaco 0.23.0 including replacement of `quickOpen` API (0.20.x) with `quickInput` API (0.23.x) [#9154](https://github.com/eclipse-theia/theia/pull/9154)
 - [workspace] `WorkspaceCommandContribution.addFolderToWorkspace` no longer accepts `undefined`. `WorkspaceService.addRoot` now accepts a `URI` or a `URI[]` [#9684](https://github.com/eclipse-theia/theia/pull/9684)
+
 ## v1.15.0 - 6/30/2021
 
 [1.15.0 Milestone](https://github.com/eclipse-theia/theia/milestone/21)
diff --git a/packages/core/src/browser/shell/application-shell.ts b/packages/core/src/browser/shell/application-shell.ts
index 339ff5f936fa7..02d511b423650 100644
--- a/packages/core/src/browser/shell/application-shell.ts
+++ b/packages/core/src/browser/shell/application-shell.ts
@@ -497,7 +497,7 @@ export class ApplicationShell extends Widget {
         const topPanel = new Panel();
         topPanel.id = 'theia-top-panel';
 
-        // hide top panel when `menuBarVisibility` preference changes
+        // Hide top panel when the `menuBarVisibility` preference changes.
         if (!environment.electron.is()) {
             this.corePreferences.onPreferenceChanged(preference => {
                 if (preference.preferenceName === 'window.menuBarVisibility') {
diff --git a/packages/core/src/browser/shell/sidebar-menu-widget.tsx b/packages/core/src/browser/shell/sidebar-menu-widget.tsx
index f81dc59259c5d..18726a1182a44 100644
--- a/packages/core/src/browser/shell/sidebar-menu-widget.tsx
+++ b/packages/core/src/browser/shell/sidebar-menu-widget.tsx
@@ -28,7 +28,10 @@ export interface SidebarMenu {
   iconClass: string;
   title: string;
   menuPath: MenuPath;
-  order: number; // smaller one place lower
+  /*
+   * Used to sort menus. The lower the value the lower they are placed in the sidebar.
+   */
+  order: number;
 }
 
 /**
diff --git a/packages/core/src/common/preferences/preference-schema.ts b/packages/core/src/common/preferences/preference-schema.ts
index 84587f075eb14..0737a5a6e3230 100644
--- a/packages/core/src/common/preferences/preference-schema.ts
+++ b/packages/core/src/common/preferences/preference-schema.ts
@@ -88,7 +88,6 @@ export interface PreferenceDataProperty extends PreferenceItem {
     description?: string;
     markdownDescription?: string;
     scope?: PreferenceScope;
-    included?: boolean;
 }
 export namespace PreferenceDataProperty {
     export function fromPreferenceSchemaProperty(schemaProps: PreferenceSchemaProperty, defaultScope: PreferenceScope = PreferenceScope.Workspace): PreferenceDataProperty {