diff --git a/src/typings/vscode-xterm.d.ts b/src/typings/vscode-xterm.d.ts
index a104e7aee355bcd1e95cadef586409f27a9b912c..2631d806ad266149ea0be8ffef336f05711a1fc1 100644
--- a/src/typings/vscode-xterm.d.ts
+++ b/src/typings/vscode-xterm.d.ts
@@ -89,6 +89,16 @@ declare module 'vscode-xterm' {
 		 */
 		experimentalCharAtlas?: 'none' | 'static' | 'dynamic';
 
+		/**
+		 * (EXPERIMENTAL) Defines which implementation to use for buffer lines.
+		 *
+		 * - 'JsArray': The default/stable implementation.
+		 * - 'TypedArray': The new experimental implementation based on TypedArrays that is expected to
+		 *   significantly boost performance and memory consumption. Use at your own risk.
+		 *
+		 * This option will be removed in the future.
+		 */
+		experimentalBufferLineImpl?: 'JsArray' | 'TypedArray';
 		/**
 		 * The font size used to render text.
 		 */