diff --git a/mcp/packages/server/data/initial_instructions.md b/mcp/packages/server/data/initial_instructions.md
index 992d071f2b..7d927f5d15 100644
--- a/mcp/packages/server/data/initial_instructions.md
+++ b/mcp/packages/server/data/initial_instructions.md
@@ -123,7 +123,7 @@ Boards can have layout systems that automatically control the positioning and sp
       Check with: `if (board.grid) { ... }`
     - Properties: `rows`, `columns`, `rowGap`, `columnGap`
     - Children are positioned via 1-based row/column indices
-        - Add to grid via `board.flex.appendChild(shape, row, column)`
+        - Add to grid via `board.grid.appendChild(shape, row, column)`
         - Modify grid positioning after the fact via `shape.layoutCell: LayoutCellProperties`
 
   * When working with boards: