diff --git a/typings/xterm.d.ts b/typings/xterm.d.ts
index 363cede3d..451da2e8e 100644
--- a/typings/xterm.d.ts
+++ b/typings/xterm.d.ts
@@ -954,6 +954,7 @@ declare module 'xterm' {
      * (EXPERIMENTAL) Adds a marker to the normal buffer and returns it. If the
      * alt buffer is active, undefined is returned.
      * @param cursorYOffset The y position offset of the marker from the cursor.
+     * @param row The y position of the marker.
      * @returns The new marker or undefined.
      */
     registerMarker(cursorYOffset?: number, row?: number): IMarker | undefined;