diff --git a/cromulant/window.py b/cromulant/window.py
index df0824f..05b80eb 100644
--- a/cromulant/window.py
+++ b/cromulant/window.py
@@ -180,6 +180,7 @@ class Window:
         root = QWidget()
         container = QHBoxLayout()
         btn_restart = QPushButton("Restart")
+        btn_restart.setToolTip(f"Restart with a new set of ants")
         btn_restart.clicked.connect(Game.restart)
 
         Window.speed = QComboBox()