diff --git a/extensions/typescript-language-features/src/features/documentSymbol.ts b/extensions/typescript-language-features/src/features/documentSymbol.ts
index b07bc9b47a0..3106fb0f361 100644
--- a/extensions/typescript-language-features/src/features/documentSymbol.ts
+++ b/extensions/typescript-language-features/src/features/documentSymbol.ts
@@ -92,6 +92,7 @@ class TypeScriptDocumentSymbolProvider implements vscode.DocumentSymbolProvider
 	private static convertNavTree(resource: vscode.Uri, bucket: vscode.DocumentSymbol[], item: Proto.NavigationTree): boolean {
 		const symbolInfo = new vscode.DocumentSymbol(
 			item.text,
+			'',
 			getSymbolKind(item.kind),
 			typeConverters.Range.fromTextSpan(item.spans[0]),
 			typeConverters.Range.fromTextSpan(item.spans[0]),
diff --git a/src/vs/editor/common/modes.ts b/src/vs/editor/common/modes.ts
index e1e99e987df..995d0b874c6 100644
--- a/src/vs/editor/common/modes.ts
+++ b/src/vs/editor/common/modes.ts
@@ -645,6 +645,7 @@ export const symbolKindToCssClass = (function () {
 
 export interface DocumentSymbol {
 	name: string;
+	detail: string;
 	kind: SymbolKind;
 	containerName?: string;
 	fullRange: IRange;
diff --git a/src/vs/editor/contrib/quickOpen/quickOpen.ts b/src/vs/editor/contrib/quickOpen/quickOpen.ts
index c75aa9e8fc0..32bc5aa6280 100644
--- a/src/vs/editor/contrib/quickOpen/quickOpen.ts
+++ b/src/vs/editor/contrib/quickOpen/quickOpen.ts
@@ -47,6 +47,7 @@ function flatten(bucket: DocumentSymbol[], entries: DocumentSymbol[], overrideCo
 		bucket.push({
 			kind: entry.kind,
 			name: entry.name,
+			detail: entry.detail,
 			containerName: entry.containerName || overrideContainerLabel,
 			fullRange: entry.fullRange,
 			identifierRange: entry.identifierRange,
diff --git a/src/vs/monaco.d.ts b/src/vs/monaco.d.ts
index 511e6725cde..2a3c5a20730 100644
--- a/src/vs/monaco.d.ts
+++ b/src/vs/monaco.d.ts
@@ -4873,6 +4873,7 @@ declare namespace monaco.languages {
 
 	export interface DocumentSymbol {
 		name: string;
+		detail: string;
 		kind: SymbolKind;
 		containerName?: string;
 		fullRange: IRange;
diff --git a/src/vs/vscode.proposed.d.ts b/src/vs/vscode.proposed.d.ts
index 1b3e2a47a18..3660bb56385 100644
--- a/src/vs/vscode.proposed.d.ts
+++ b/src/vs/vscode.proposed.d.ts
@@ -386,6 +386,11 @@ declare module 'vscode' {
 		 */
 		name: string;
 
+		/**
+		 * More detail for this symbol, e.g the signature of a function.
+		 */
+		detail: string;
+
 		/**
 		 * The kind of this symbol.
 		 */
@@ -411,11 +416,12 @@ declare module 'vscode' {
 		 * Creates a new document symbol.
 		 *
 		 * @param name The name of the symbol.
+		 * @param detail Details for the symbol.
 		 * @param kind The kind of the symbol.
 		 * @param fullRange The full range of the symbol.
 		 * @param gotoRange The range that should be reveal.
 		 */
-		constructor(name: string, kind: SymbolKind, fullRange: Range, gotoRange: Range);
+		constructor(name: string, detail: string, kind: SymbolKind, fullRange: Range, gotoRange: Range);
 	}
 
 	export interface DocumentSymbolProvider {
diff --git a/src/vs/workbench/api/node/extHostTypeConverters.ts b/src/vs/workbench/api/node/extHostTypeConverters.ts
index e16843c2412..3ee9ba84150 100644
--- a/src/vs/workbench/api/node/extHostTypeConverters.ts
+++ b/src/vs/workbench/api/node/extHostTypeConverters.ts
@@ -379,6 +379,7 @@ export namespace DocumentSymbol {
 	export function from(info: vscode.DocumentSymbol): modes.DocumentSymbol {
 		let result: modes.DocumentSymbol = {
 			name: info.name,
+			detail: info.detail,
 			fullRange: Range.from(info.fullRange),
 			identifierRange: Range.from(info.gotoRange),
 			kind: SymbolKind.from(info.kind)
@@ -391,6 +392,7 @@ export namespace DocumentSymbol {
 	export function to(info: modes.DocumentSymbol): vscode.DocumentSymbol {
 		let result = new types.DocumentSymbol(
 			info.name,
+			info.detail,
 			SymbolKind.to(info.kind),
 			Range.to(info.fullRange),
 			Range.to(info.identifierRange),
diff --git a/src/vs/workbench/api/node/extHostTypes.ts b/src/vs/workbench/api/node/extHostTypes.ts
index 5f4e216580a..45d1aae95b7 100644
--- a/src/vs/workbench/api/node/extHostTypes.ts
+++ b/src/vs/workbench/api/node/extHostTypes.ts
@@ -883,17 +883,23 @@ export class SymbolInformation {
 
 export class DocumentSymbol {
 	name: string;
+	detail: string;
 	kind: SymbolKind;
 	fullRange: Range;
 	gotoRange: Range;
 	children: DocumentSymbol[];
 
-	constructor(name: string, kind: SymbolKind, fullRange: Range, gotoRange: Range) {
+	constructor(name: string, detail: string, kind: SymbolKind, fullRange: Range, gotoRange: Range) {
 		this.name = name;
+		this.detail = detail;
 		this.kind = kind;
 		this.fullRange = fullRange;
 		this.gotoRange = gotoRange;
 		this.children = [];
+
+		if (!this.fullRange.contains(this.gotoRange)) {
+			throw new Error('gotoRange must be contained in fullRange');
+		}
 	}
 }
 
diff --git a/src/vs/workbench/parts/outline/test/electron-browser/outlineModel.test.ts b/src/vs/workbench/parts/outline/test/electron-browser/outlineModel.test.ts
index b01fd933f91..2f5f81785fa 100644
--- a/src/vs/workbench/parts/outline/test/electron-browser/outlineModel.test.ts
+++ b/src/vs/workbench/parts/outline/test/electron-browser/outlineModel.test.ts
@@ -17,6 +17,7 @@ suite('OutlineModel', function () {
 	function fakeSymbolInformation(range: Range, name: string = 'foo'): DocumentSymbol {
 		return {
 			name,
+			detail: 'fake',
 			kind: SymbolKind.Boolean,
 			identifierRange: range,
 			fullRange: range