diff --git a/grid.py b/grid.py
index a124e29..e3f9c89 100644
--- a/grid.py
+++ b/grid.py
@@ -47,7 +47,7 @@ class Grid:
             self.__trackBoundaries(pos)
             self.__grid[pos] = not self.__default
 
-    def set(self, pos: Coordinate, value: Any):
+    def set(self, pos: Coordinate, value: Any = True):
         if value in OFF_STATES and pos in self.__grid:
             del self.__grid[pos]
         elif value not in OFF_STATES: