diff --git a/src/vs/vscode.proposed.d.ts b/src/vs/vscode.proposed.d.ts
index 10bc6631678..5ed9c62424c 100644
--- a/src/vs/vscode.proposed.d.ts
+++ b/src/vs/vscode.proposed.d.ts
@@ -476,11 +476,12 @@ declare module 'vscode' {
 	export class HierarchicalSymbolInformation {
 		name: string;
 		kind: SymbolKind;
+		detail: string;
 		location: Location;
 		range: Range;
 		children: HierarchicalSymbolInformation[];
 
-		constructor(name: string, kind: SymbolKind, location: Location, range: Range);
+		constructor(name: string, detail: string, kind: SymbolKind, location: Location, range: Range);
 	}
 
 	export interface DocumentSymbolProvider {
diff --git a/src/vs/workbench/api/node/extHost.api.impl.ts b/src/vs/workbench/api/node/extHost.api.impl.ts
index 8afaaa63c6c..a8012a216c9 100644
--- a/src/vs/workbench/api/node/extHost.api.impl.ts
+++ b/src/vs/workbench/api/node/extHost.api.impl.ts
@@ -669,9 +669,9 @@ export function createApiFactory(
 			StatusBarAlignment: extHostTypes.StatusBarAlignment,
 			SymbolInformation: extHostTypes.SymbolInformation,
 			HierarchicalSymbolInformation: class extends extHostTypes.HierarchicalSymbolInformation {
-				constructor(name, kind, keyof, range) {
+				constructor(name, kind, detail, keyof, range) {
 					checkProposedApiEnabled(extension);
-					super(name, kind, keyof, range);
+					super(name, kind, detail, keyof, range);
 				}
 			},
 			SymbolKind: extHostTypes.SymbolKind,
diff --git a/src/vs/workbench/api/node/extHostTypes.ts b/src/vs/workbench/api/node/extHostTypes.ts
index 7d66e05515d..743bf0c8d1b 100644
--- a/src/vs/workbench/api/node/extHostTypes.ts
+++ b/src/vs/workbench/api/node/extHostTypes.ts
@@ -879,11 +879,12 @@ export class SymbolInformation {
 export class HierarchicalSymbolInformation {
 	name: string;
 	location: Location;
+	detail: string;
 	kind: SymbolKind;
 	range: Range;
 	children: HierarchicalSymbolInformation[];
 
-	constructor(name: string, kind: SymbolKind, location: Location, range: Range) {
+	constructor(name: string, kind: SymbolKind, detail: string, location: Location, range: Range) {
 		this.name = name;
 		this.kind = kind;
 		this.location = location;