diff --git a/src/vs/vscode.d.ts b/src/vs/vscode.d.ts
index 32e34faf85e172d21401dc887273e3ab3847e995..592f8a035c76d492f00fd8025b15c71aaf993801 100644
--- a/src/vs/vscode.d.ts
+++ b/src/vs/vscode.d.ts
@@ -6580,11 +6580,6 @@ declare module 'vscode' {
 		 */
 		readonly onDidChangeVisibility: Event<TreeViewVisibilityChangeEvent>;
 
-		/**
-		 * An optional human-readable message that will be rendered in the view.
-		 */
-		message?: string | MarkdownString;
-
 		/**
 		 * Reveals the given element in the tree view.
 		 * If the tree view is not visible then the tree view is shown and element is revealed.
diff --git a/src/vs/vscode.proposed.d.ts b/src/vs/vscode.proposed.d.ts
index 9e7491143129dfbee4fabd8ec10ecd860d5e4fea..8a585190a9e3f977ca36dda67a49eaa1684f033b 100644
--- a/src/vs/vscode.proposed.d.ts
+++ b/src/vs/vscode.proposed.d.ts
@@ -1090,6 +1090,15 @@ declare module 'vscode' {
 
 	//#region Tree View
 
+	export interface TreeView<T> {
+
+		/**
+		 * An optional human-readable message that will be rendered in the view.
+		 */
+		message?: string | MarkdownString;
+
+	}
+
 	/**
 	 * Label describing the [Tree item](#TreeItem)
 	 */