diff --git a/src/vs/vscode.proposed.d.ts b/src/vs/vscode.proposed.d.ts
index 9b3a074851d..48b1f768187 100644
--- a/src/vs/vscode.proposed.d.ts
+++ b/src/vs/vscode.proposed.d.ts
@@ -437,10 +437,13 @@ declare module 'vscode' {
 	export namespace env {
 		/**
 		 * Current logging level.
-		 *
-		 * @readonly
 		 */
 		export const logLevel: LogLevel;
+
+		/**
+		 * An [event](#Event) that fires when the log level has changed.
+		 */
+		export const onDidChangeLogLevel: Event<LogLevel>;
 	}
 
 	//#endregion
diff --git a/src/vs/workbench/api/node/extHost.api.impl.ts b/src/vs/workbench/api/node/extHost.api.impl.ts
index a8afbaabb36..8bf889401c0 100644
--- a/src/vs/workbench/api/node/extHost.api.impl.ts
+++ b/src/vs/workbench/api/node/extHost.api.impl.ts
@@ -230,6 +230,10 @@ export function createApiFactory(
 			get logLevel() {
 				checkProposedApiEnabled(extension);
 				return extHostLogService.getLevel();
+			},
+			get onDidChangeLogLevel() {
+				checkProposedApiEnabled(extension);
+				return extHostLogService.onDidChangeLogLevel;
 			}
 		});