diff --git a/src/vs/code/electron-main/app.ts b/src/vs/code/electron-main/app.ts
index 9c487c3475c..841d59b486c 100644
--- a/src/vs/code/electron-main/app.ts
+++ b/src/vs/code/electron-main/app.ts
@@ -801,8 +801,11 @@ export class CodeApplication extends Disposable {
 		const app = this;
 		const environmentService = this.environmentMainService;
 		const productService = this.productService;
+		const logService = this.logService;
 		urlService.registerHandler({
 			async handleURL(uri: URI, options?: IOpenURLOptions): Promise<boolean> {
+				logService.trace('app#handleURL: ', uri.toString(true), options);
+
 				if (uri.scheme === productService.urlProtocol && uri.path === 'workspace') {
 					uri = uri.with({
 						authority: 'file',
@@ -818,6 +821,7 @@ export class CodeApplication extends Disposable {
 
 				// Check for URIs to open in window
 				const windowOpenableFromProtocolLink = app.getWindowOpenableFromProtocolLink(uri);
+				logService.trace('app#handleURL: windowOpenableFromProtocolLink = ', windowOpenableFromProtocolLink);
 				if (windowOpenableFromProtocolLink) {
 					const [window] = windowsMainService.open({
 						context: OpenContext.API,