diff --git a/src/vs/vscode.d.ts b/src/vs/vscode.d.ts
index b5041e64357..61d20f9ebfe 100644
--- a/src/vs/vscode.d.ts
+++ b/src/vs/vscode.d.ts
@@ -2611,12 +2611,14 @@ declare module 'vscode' {
 		provideDocumentSymbols(document: TextDocument, token: CancellationToken): ProviderResult<SymbolInformation[] | DocumentSymbol[]>;
 	}
 
+	/**
+	 * Metadata about a document symbol provider.
+	 */
 	export interface DocumentSymbolProviderMetadata {
 		/**
-		 * If there is more than one outline provider, this name will be used in the outline tree to
-		 *   distinguish between them.
+		 * A human readable string that is shown when multiple outlines trees show for one document.
 		 */
-		displayName?: string;
+		label?: string;
 	}
 
 	/**
diff --git a/src/vs/workbench/api/node/extHost.protocol.ts b/src/vs/workbench/api/node/extHost.protocol.ts
index 0db9f340d53..58363b7e6e5 100644
--- a/src/vs/workbench/api/node/extHost.protocol.ts
+++ b/src/vs/workbench/api/node/extHost.protocol.ts
@@ -278,7 +278,7 @@ export interface ISerializedSignatureHelpProviderMetadata {
 
 export interface MainThreadLanguageFeaturesShape extends IDisposable {
 	$unregister(handle: number): void;
-	$registerOutlineSupport(handle: number, selector: ISerializedDocumentFilter[], extensionId: string): void;
+	$registerOutlineSupport(handle: number, selector: ISerializedDocumentFilter[], label: string): void;
 	$registerCodeLensSupport(handle: number, selector: ISerializedDocumentFilter[], eventHandle: number): void;
 	$emitCodeLensEvent(eventHandle: number, event?: any): void;
 	$registerDefinitionSupport(handle: number, selector: ISerializedDocumentFilter[]): void;
diff --git a/src/vs/workbench/api/node/extHostLanguageFeatures.ts b/src/vs/workbench/api/node/extHostLanguageFeatures.ts
index 6f1ae0d1891..b735f50fbf6 100644
--- a/src/vs/workbench/api/node/extHostLanguageFeatures.ts
+++ b/src/vs/workbench/api/node/extHostLanguageFeatures.ts
@@ -975,7 +975,7 @@ export class ExtHostLanguageFeatures implements ExtHostLanguageFeaturesShape {
 
 	registerDocumentSymbolProvider(extension: IExtensionDescription, selector: vscode.DocumentSelector, provider: vscode.DocumentSymbolProvider, metadata?: vscode.DocumentSymbolProviderMetadata): vscode.Disposable {
 		const handle = this._addNewAdapter(new OutlineAdapter(this._documents, provider), extension);
-		const displayName = (metadata && metadata.displayName) || (extension && (extension.displayName || extension.name)) || undefined;
+		const displayName = (metadata && metadata.label) || (extension && (extension.displayName || extension.name)) || undefined;
 		this._proxy.$registerOutlineSupport(handle, this._transformDocumentSelector(selector), displayName);
 		return this._createDisposable(handle);
 	}