diff --git a/extensions/image-preview/src/extension.ts b/extensions/image-preview/src/extension.ts
index 5a32a1a20666151233d471e975363b571eae04dd..e6b394fa29b5c663fa10ad367ae08f827bfaafbd 100644
--- a/extensions/image-preview/src/extension.ts
+++ b/extensions/image-preview/src/extension.ts
@@ -24,7 +24,7 @@ export function activate(context: vscode.ExtensionContext) {
 	const previewManager = new PreviewManager(extensionRoot, sizeStatusBarEntry, binarySizeStatusBarEntry, zoomStatusBarEntry);
 
 	context.subscriptions.push(vscode.window.registerCustomEditorProvider2(PreviewManager.viewType, previewManager, {
-		supportsMultipleEditorsPerResource: true,
+		supportsMultipleEditorsPerDocument: true,
 	}));
 
 	context.subscriptions.push(vscode.commands.registerCommand('imagePreview.zoomIn', () => {
diff --git a/src/vs/vscode.proposed.d.ts b/src/vs/vscode.proposed.d.ts
index 36871c6126f4a51afc7fb16912baa6a0e04bb48b..b70937e6e4bf94ecc33f36be8789f12c8f4fcebf 100644
--- a/src/vs/vscode.proposed.d.ts
+++ b/src/vs/vscode.proposed.d.ts
@@ -1491,7 +1491,7 @@ declare module 'vscode' {
 				 * When set, users can split and create copies of the custom editor. The custom editor must make sure it
 				 * can properly synchronize the states of all editor instances for a resource so that they are consistent.
 				 */
-				readonly supportsMultipleEditorsPerResource?: boolean;
+				readonly supportsMultipleEditorsPerDocument?: boolean;
 			}
 		): Disposable;
 	}
diff --git a/src/vs/workbench/api/browser/mainThreadWebview.ts b/src/vs/workbench/api/browser/mainThreadWebview.ts
index 31ca00e86c158170005ced8dddbeb4e41e4d4036..0af4788840aa5a155feba58650f3542819830e51 100644
--- a/src/vs/workbench/api/browser/mainThreadWebview.ts
+++ b/src/vs/workbench/api/browser/mainThreadWebview.ts
@@ -309,8 +309,8 @@ export class MainThreadWebviews extends Disposable implements extHostProtocol.Ma
 		this.registerEditorProvider(ModelType.Text, extensionData, viewType, options, capabilities, true);
 	}
 
-	public $registerCustomEditorProvider(extensionData: extHostProtocol.WebviewExtensionDescription, viewType: string, options: modes.IWebviewPanelOptions, supportsMultipleEditorsPerResource: boolean): void {
-		this.registerEditorProvider(ModelType.Custom, extensionData, viewType, options, {}, supportsMultipleEditorsPerResource);
+	public $registerCustomEditorProvider(extensionData: extHostProtocol.WebviewExtensionDescription, viewType: string, options: modes.IWebviewPanelOptions, supportsMultipleEditorsPerDocument: boolean): void {
+		this.registerEditorProvider(ModelType.Custom, extensionData, viewType, options, {}, supportsMultipleEditorsPerDocument);
 	}
 
 	private registerEditorProvider(
@@ -319,14 +319,14 @@ export class MainThreadWebviews extends Disposable implements extHostProtocol.Ma
 		viewType: string,
 		options: modes.IWebviewPanelOptions,
 		capabilities: extHostProtocol.CustomTextEditorCapabilities,
-		supportsMultipleEditorsPerResource: boolean,
+		supportsMultipleEditorsPerDocument: boolean,
 	): DisposableStore {
 		if (this._editorProviders.has(viewType)) {
 			throw new Error(`Provider for ${viewType} already registered`);
 		}
 
 		this._customEditorService.registerCustomEditorCapabilities(viewType, {
-			supportsMultipleEditorsPerResource
+			supportsMultipleEditorsPerDocument
 		});
 
 		const extension = reviveWebviewExtension(extensionData);
diff --git a/src/vs/workbench/api/common/extHost.api.impl.ts b/src/vs/workbench/api/common/extHost.api.impl.ts
index 33b7ade6508b4672c2819ab5c6369352a6f40f2e..abdf14aee5dbef3d98f0a955fa91d6969bce099e 100644
--- a/src/vs/workbench/api/common/extHost.api.impl.ts
+++ b/src/vs/workbench/api/common/extHost.api.impl.ts
@@ -588,7 +588,7 @@ export function createApiFactoryAndRegisterActors(accessor: ServicesAccessor): I
 			registerCustomEditorProvider: (viewType: string, provider: vscode.CustomTextEditorProvider, options: { webviewOptions?: vscode.WebviewPanelOptions } = {}) => {
 				return extHostWebviews.registerCustomEditorProvider(extension, viewType, provider, options);
 			},
-			registerCustomEditorProvider2: (viewType: string, provider: vscode.CustomEditorProvider, options: { webviewOptions?: vscode.WebviewPanelOptions, supportsMultipleEditorsPerResource?: boolean } = {}) => {
+			registerCustomEditorProvider2: (viewType: string, provider: vscode.CustomEditorProvider, options: { webviewOptions?: vscode.WebviewPanelOptions, supportsMultipleEditorsPerDocument?: boolean } = {}) => {
 				checkProposedApiEnabled(extension);
 				return extHostWebviews.registerCustomEditorProvider(extension, viewType, provider, options);
 			},
diff --git a/src/vs/workbench/api/common/extHost.protocol.ts b/src/vs/workbench/api/common/extHost.protocol.ts
index 101a938cb70f76bdfa3c90a4b039f4efbce62448..bae18569b5a8e0ac47c0a186860941c8eeb45aa4 100644
--- a/src/vs/workbench/api/common/extHost.protocol.ts
+++ b/src/vs/workbench/api/common/extHost.protocol.ts
@@ -612,7 +612,7 @@ export interface MainThreadWebviewsShape extends IDisposable {
 	$unregisterSerializer(viewType: string): void;
 
 	$registerTextEditorProvider(extension: WebviewExtensionDescription, viewType: string, options: modes.IWebviewPanelOptions, capabilities: CustomTextEditorCapabilities): void;
-	$registerCustomEditorProvider(extension: WebviewExtensionDescription, viewType: string, options: modes.IWebviewPanelOptions, supportsMultipleEditorsPerResource: boolean): void;
+	$registerCustomEditorProvider(extension: WebviewExtensionDescription, viewType: string, options: modes.IWebviewPanelOptions, supportsMultipleEditorsPerDocument: boolean): void;
 	$unregisterEditorProvider(viewType: string): void;
 
 	$onDidEdit(resource: UriComponents, viewType: string, editId: number, label: string | undefined): void;
diff --git a/src/vs/workbench/api/common/extHostWebview.ts b/src/vs/workbench/api/common/extHostWebview.ts
index 5fe0c539953bca68dd1cbf5987cf7bd2ede6716a..2bf7e9a54d16867ae12cd5b690534cded69d8021 100644
--- a/src/vs/workbench/api/common/extHostWebview.ts
+++ b/src/vs/workbench/api/common/extHostWebview.ts
@@ -460,7 +460,7 @@ export class ExtHostWebviews implements extHostProtocol.ExtHostWebviewsShape {
 		extension: IExtensionDescription,
 		viewType: string,
 		provider: vscode.CustomEditorProvider | vscode.CustomTextEditorProvider,
-		options: { webviewOptions?: vscode.WebviewPanelOptions, supportsMultipleEditorsPerResource?: boolean },
+		options: { webviewOptions?: vscode.WebviewPanelOptions, supportsMultipleEditorsPerDocument?: boolean },
 	): vscode.Disposable {
 		const disposables = new DisposableStore();
 		if ('resolveCustomTextEditor' in provider) {
@@ -470,7 +470,7 @@ export class ExtHostWebviews implements extHostProtocol.ExtHostWebviewsShape {
 			});
 		} else {
 			disposables.add(this._editorProviders.addCustomProvider(viewType, extension, provider));
-			this._proxy.$registerCustomEditorProvider(toExtensionData(extension), viewType, options.webviewOptions || {}, !!options.supportsMultipleEditorsPerResource);
+			this._proxy.$registerCustomEditorProvider(toExtensionData(extension), viewType, options.webviewOptions || {}, !!options.supportsMultipleEditorsPerDocument);
 		}
 
 		return extHostTypes.Disposable.from(
diff --git a/src/vs/workbench/contrib/customEditor/browser/customEditors.ts b/src/vs/workbench/contrib/customEditor/browser/customEditors.ts
index a275ead51a0544a14e14bfa98205c804a735d018..2f64fa0f540f9e140782d831f5b11bc336e8de6e 100644
--- a/src/vs/workbench/contrib/customEditor/browser/customEditors.ts
+++ b/src/vs/workbench/contrib/customEditor/browser/customEditors.ts
@@ -207,7 +207,7 @@ export class CustomEditorService extends Disposable implements ICustomEditorServ
 		}
 
 		const capabilities = this.getCustomEditorCapabilities(viewType) || {};
-		if (!capabilities.supportsMultipleEditorsPerResource) {
+		if (!capabilities.supportsMultipleEditorsPerDocument) {
 			const movedEditor = await this.tryRevealExistingEditorForResourceInGroup(resource, viewType, options, group);
 			if (movedEditor) {
 				return movedEditor;
diff --git a/src/vs/workbench/contrib/customEditor/common/customEditor.ts b/src/vs/workbench/contrib/customEditor/common/customEditor.ts
index 10a22fe2b63e532348c1c17f42b6a770ffe961c8..59eff7d096ac7168f9d63fbea08c59569de8444c 100644
--- a/src/vs/workbench/contrib/customEditor/common/customEditor.ts
+++ b/src/vs/workbench/contrib/customEditor/common/customEditor.ts
@@ -22,7 +22,7 @@ export const CONTEXT_CUSTOM_EDITORS = new RawContextKey<string>('customEditors',
 export const CONTEXT_FOCUSED_CUSTOM_EDITOR_IS_EDITABLE = new RawContextKey<boolean>('focusedCustomEditorIsEditable', false);
 
 export interface CustomEditorCapabilities {
-	readonly supportsMultipleEditorsPerResource?: boolean;
+	readonly supportsMultipleEditorsPerDocument?: boolean;
 }
 
 export interface ICustomEditorService {