diff --git a/src/vs/vscode.proposed.d.ts b/src/vs/vscode.proposed.d.ts
index 209ae8df9d0..73f79fd819e 100644
--- a/src/vs/vscode.proposed.d.ts
+++ b/src/vs/vscode.proposed.d.ts
@@ -25,6 +25,21 @@ declare module 'vscode' {
 		scopes: string[]
 	}
 
+	/**
+	 * An [event](#Event) which fires when an [AuthenticationProvider](#AuthenticationProvider) is added or removed.
+	 */
+	export interface AuthenticationProvidersChangeEvent {
+		/**
+		 * The ids of the [authenticationProvider](#AuthenticationProvider)s that have been added.
+		 */
+		readonly added: string[];
+
+		/**
+		 * The ids of the [authenticationProvider](#AuthenticationProvider)s that have been removed..
+		 */
+		readonly removed: string[];
+	}
+
 	export interface AuthenticationProvider {
 		/**
 		 * Used as an identifier for extensions trying to work with a particular
@@ -33,6 +48,11 @@ declare module 'vscode' {
 		 */
 		readonly id: string;
 		readonly displayName: string;
+
+		/**
+		 * A [enent](#Event) which fires when the array of sessions has changed, or data
+		 * within a session has changed.
+		 */
 		readonly onDidChangeSessions: Event<void>;
 
 		/**
@@ -53,8 +73,7 @@ declare module 'vscode' {
 		/**
 		 * Fires with the provider id that was registered or unregistered.
 		 */
-		export const onDidRegisterAuthenticationProvider: Event<string>;
-		export const onDidUnregisterAuthenticationProvider: Event<string>;
+		export const onDidChangeAuthenticationProviders: Event<AuthenticationProvidersChangeEvent>;
 
 		export const providers: ReadonlyArray<AuthenticationProvider>;
 	}
diff --git a/src/vs/workbench/api/common/extHost.api.impl.ts b/src/vs/workbench/api/common/extHost.api.impl.ts
index 91045fcda6c..897af14d451 100644
--- a/src/vs/workbench/api/common/extHost.api.impl.ts
+++ b/src/vs/workbench/api/common/extHost.api.impl.ts
@@ -188,11 +188,8 @@ export function createApiFactoryAndRegisterActors(accessor: ServicesAccessor): I
 			get providers() {
 				return extHostAuthentication.providers(extension);
 			},
-			get onDidRegisterAuthenticationProvider() {
-				return extHostAuthentication.onDidRegisterAuthenticationProvider;
-			},
-			get onDidUnregisterAuthenticationProvider() {
-				return extHostAuthentication.onDidUnregisterAuthenticationProvider;
+			get onDidChangeAuthenticationProviders(): Event<vscode.AuthenticationProvidersChangeEvent> {
+				return extHostAuthentication.onDidChangeAuthenticationProviders;
 			}
 		};
 
diff --git a/src/vs/workbench/api/common/extHostAuthentication.ts b/src/vs/workbench/api/common/extHostAuthentication.ts
index c4518b0a407..326610264f7 100644
--- a/src/vs/workbench/api/common/extHostAuthentication.ts
+++ b/src/vs/workbench/api/common/extHostAuthentication.ts
@@ -55,11 +55,8 @@ export class ExtHostAuthentication implements ExtHostAuthenticationShape {
 	private _proxy: MainThreadAuthenticationShape;
 	private _authenticationProviders: Map<string, vscode.AuthenticationProvider> = new Map<string, vscode.AuthenticationProvider>();
 
-	private _onDidRegisterAuthenticationProvider = new Emitter<string>();
-	readonly onDidRegisterAuthenticationProvider: Event<string> = this._onDidRegisterAuthenticationProvider.event;
-
-	private _onDidUnregisterAuthenticationProvider = new Emitter<string>();
-	readonly onDidUnregisterAuthenticationProvider: Event<string> = this._onDidUnregisterAuthenticationProvider.event;
+	private _onDidChangeAuthenticationProviders = new Emitter<vscode.AuthenticationProvidersChangeEvent>();
+	readonly onDidChangeAuthenticationProviders: Event<vscode.AuthenticationProvidersChangeEvent> = this._onDidChangeAuthenticationProviders.event;
 
 	constructor(mainContext: IMainContext) {
 		this._proxy = mainContext.getProxy(MainContext.MainThreadAuthentication);
@@ -83,13 +80,13 @@ export class ExtHostAuthentication implements ExtHostAuthenticationShape {
 		});
 
 		this._proxy.$registerAuthenticationProvider(provider.id, provider.displayName);
-		this._onDidRegisterAuthenticationProvider.fire(provider.id);
+		this._onDidChangeAuthenticationProviders.fire({ added: [provider.id], removed: [] });
 
 		return new Disposable(() => {
 			listener.dispose();
 			this._authenticationProviders.delete(provider.id);
 			this._proxy.$unregisterAuthenticationProvider(provider.id);
-			this._onDidUnregisterAuthenticationProvider.fire(provider.id);
+			this._onDidChangeAuthenticationProviders.fire({ added: [], removed: [provider.id] });
 		});
 	}