diff --git a/extensions/grunt/src/main.ts b/extensions/grunt/src/main.ts
index 8576b199e63..2b06e1de16b 100644
--- a/extensions/grunt/src/main.ts
+++ b/extensions/grunt/src/main.ts
@@ -169,16 +169,17 @@ async function getGruntTasks(): Promise<vscode.Task[]> {
 						let regExp = /^\s*(\S.*\S)  \S/g;
 						let matches = regExp.exec(line);
 						if (matches && matches.length === 2) {
-							let taskName = matches[1];
+							let name = matches[1];
 							let kind: GruntTaskKind = {
 								type: 'grunt',
-								task: taskName
+								task: name
 							};
-							let task = taskName.indexOf(' ') === -1
-								? new vscode.Task(kind, taskName, new vscode.ShellExecution(`${command} ${taskName}`))
-								: new vscode.Task(kind, taskName, new vscode.ShellExecution(`${command} "${taskName}"`));
+							let source = 'grunt';
+							let task = name.indexOf(' ') === -1
+								? new vscode.Task(kind, name, source, new vscode.ShellExecution(`${command} ${name}`))
+								: new vscode.Task(kind, name, source, new vscode.ShellExecution(`${command} "${name}"`));
 							result.push(task);
-							let lowerCaseTaskName = taskName.toLowerCase();
+							let lowerCaseTaskName = name.toLowerCase();
 							if (isBuildTask(lowerCaseTaskName)) {
 								task.group = vscode.TaskGroup.Build;
 							} else if (isTestTask(lowerCaseTaskName)) {
diff --git a/extensions/gulp/src/main.ts b/extensions/gulp/src/main.ts
index c850de3912c..865880c19ca 100644
--- a/extensions/gulp/src/main.ts
+++ b/extensions/gulp/src/main.ts
@@ -151,7 +151,7 @@ async function getGulpTasks(): Promise<vscode.Task[]> {
 					type: 'gulp',
 					task: line
 				};
-				let task = new vscode.Task(kind, line, new vscode.ShellExecution(`${gulpCommand} ${line}`));
+				let task = new vscode.Task(kind, line, 'gulp', new vscode.ShellExecution(`${gulpCommand} ${line}`));
 				result.push(task);
 				let lowerCaseLine = line.toLowerCase();
 				if (isBuildTask(lowerCaseLine)) {
diff --git a/extensions/jake/src/main.ts b/extensions/jake/src/main.ts
index 75faf14d461..37f2d795200 100644
--- a/extensions/jake/src/main.ts
+++ b/extensions/jake/src/main.ts
@@ -155,7 +155,7 @@ async function getJakeTasks(): Promise<vscode.Task[]> {
 						type: 'jake',
 						task: taskName
 					};
-					let task = new vscode.Task(kind, taskName, new vscode.ShellExecution(`${jakeCommand} ${taskName}`));
+					let task = new vscode.Task(kind, taskName, 'jake', new vscode.ShellExecution(`${jakeCommand} ${taskName}`));
 					result.push(task);
 					let lowerCaseLine = line.toLowerCase();
 					if (isBuildTask(lowerCaseLine)) {
diff --git a/extensions/npm/src/main.ts b/extensions/npm/src/main.ts
index d0416ba9951..c7db7206f9d 100644
--- a/extensions/npm/src/main.ts
+++ b/extensions/npm/src/main.ts
@@ -113,7 +113,7 @@ async function getNpmScriptsAsTasks(): Promise<vscode.Task[]> {
 				type: 'npm',
 				script: each
 			};
-			const task = new vscode.Task(kind, `run ${each}`, new vscode.ShellExecution(`npm run ${each}`));
+			const task = new vscode.Task(kind, `run ${each}`, 'npm', new vscode.ShellExecution(`npm run ${each}`));
 			const lowerCaseTaskName = each.toLowerCase();
 			if (isBuildTask(lowerCaseTaskName)) {
 				task.group = vscode.TaskGroup.Build;
@@ -123,7 +123,7 @@ async function getNpmScriptsAsTasks(): Promise<vscode.Task[]> {
 			result.push(task);
 		});
 		// add some 'well known' npm tasks
-		result.push(new vscode.Task({ type: 'npm', script: 'install' } as NpmTaskKind, `install`, new vscode.ShellExecution(`npm install`)));
+		result.push(new vscode.Task({ type: 'npm', script: 'install' } as NpmTaskKind, `install`, 'npm', new vscode.ShellExecution(`npm install`)));
 		return Promise.resolve(result);
 	} catch (e) {
 		return Promise.resolve(emptyTasks);
diff --git a/extensions/typescript/src/features/taskProvider.ts b/extensions/typescript/src/features/taskProvider.ts
index 0fa5afd1900..e6a2c8af966 100644
--- a/extensions/typescript/src/features/taskProvider.ts
+++ b/extensions/typescript/src/features/taskProvider.ts
@@ -54,8 +54,7 @@ class TscTaskProvider implements vscode.TaskProvider {
 		return projects.map(configFile => {
 			const configFileName = path.relative(rootPath, configFile);
 			const identifier: TypeScriptTaskIdentifier = { type: 'typescript', tsconfig: configFileName };
-			const buildTask = new vscode.Task(identifier, `build ${configFileName}`, new vscode.ShellExecution(`${command} -p "${configFile}"`), '$tsc');
-			buildTask.source = 'tsc';
+			const buildTask = new vscode.Task(identifier, `build ${configFileName}`, 'tsc', new vscode.ShellExecution(`${command} -p "${configFile}"`), '$tsc');
 			buildTask.group = vscode.TaskGroup.Build;
 			return buildTask;
 		});
diff --git a/src/vs/vscode.proposed.d.ts b/src/vs/vscode.proposed.d.ts
index 2d65428674b..c6c348c1b18 100644
--- a/src/vs/vscode.proposed.d.ts
+++ b/src/vs/vscode.proposed.d.ts
@@ -250,29 +250,32 @@ declare module 'vscode' {
 		 *
 		 * @param kind The task kind as defined in the 'taskKinds' extension point.
 		 * @param name The task's name. Is presented in the user interface.
+		 * @param source The task's source (e.g. 'gulp', 'npm', ...). Is presented in the user interface.
 		 */
-		constructor(kind: TaskKind, name: string);
+		constructor(kind: TaskKind, name: string, source: string);
 
 		/**
 		 * Creates a new task.
 		 *
 		 * @param kind The task kind as defined in the 'taskKinds' extension point.
 		 * @param name The task's name. Is presented in the user interface.
+		 * @param source The task's source (e.g. 'gulp', 'npm', ...). Is presented in the user interface.
 		 * @param execution The process or shell execution.
 		 */
-		constructor(kind: TaskKind, name: string, execution: ProcessExecution | ShellExecution);
+		constructor(kind: TaskKind, name: string, source: string, execution: ProcessExecution | ShellExecution);
 
 		/**
 		 * Creates a new task.
 		 *
 		 * @param kind The task kind as defined in the 'taskKinds' extension point.
 		 * @param name The task's name. Is presented in the user interface.
+		 * @param source The task's source (e.g. 'gulp', 'npm', ...). Is presented in the user interface.
 		 * @param execution The process or shell execution.
 		 * @param problemMatchers the names of problem matchers to use, like '$tsc'
 		 *  or '$eslint'. Problem matchers can be contributed by an extension using
 		 *  the `problemMatchers` extension point.
 		 */
-		constructor(kind: TaskKind, name: string, execution: ProcessExecution | ShellExecution, problemMatchers?: string | string[]);
+		constructor(kind: TaskKind, name: string, source: string, execution: ProcessExecution | ShellExecution, problemMatchers?: string | string[]);
 
 		/**
 		 * The task's kind.
diff --git a/src/vs/workbench/api/node/extHostTypes.ts b/src/vs/workbench/api/node/extHostTypes.ts
index 61b9ef84b1c..a7e573f6a35 100644
--- a/src/vs/workbench/api/node/extHostTypes.ts
+++ b/src/vs/workbench/api/node/extHostTypes.ts
@@ -1164,13 +1164,14 @@ export class Task implements vscode.Task {
 	private _presentationOptions: vscode.TaskPresentationOptions;
 
 
-	constructor(kind: vscode.TaskKind, name: string);
-	constructor(kind: vscode.TaskKind, name: string, execution: ProcessExecution | ShellExecution);
-	constructor(kind: vscode.TaskKind, name: string, execution: ProcessExecution | ShellExecution, problemMatchers?: string | string[]);
+	constructor(kind: vscode.TaskKind, name: string, source: string);
+	constructor(kind: vscode.TaskKind, name: string, source: string, execution: ProcessExecution | ShellExecution);
+	constructor(kind: vscode.TaskKind, name: string, source: string, execution: ProcessExecution | ShellExecution, problemMatchers?: string | string[]);
 
-	constructor(kind: vscode.TaskKind, name: string, execution?: ProcessExecution | ShellExecution, problemMatchers?: string | string[]) {
+	constructor(kind: vscode.TaskKind, name: string, source: string, execution?: ProcessExecution | ShellExecution, problemMatchers?: string | string[]) {
 		this.kind = kind;
 		this.name = name;
+		this.source = source;
 		this.execution = execution;
 		if (typeof problemMatchers === 'string') {
 			this._problemMatchers = [problemMatchers];