diff --git a/plots/animation.py b/plots/animation.py
index d52e2d7464d9674caa3c703b790287644091ab3f..ad7ab8561e43cfd9094a2ae59db6bf56a26b99e3 100644
--- a/plots/animation.py
+++ b/plots/animation.py
@@ -20,6 +20,7 @@ def animate(i):
     yi = y[i*N:(i+1)*N]
     plt.cla()
     plt.scatter(xi, yi, s=0.1)
+    plt.scatter(np.sum(xi)/N, np.sum(yi)/N, s=1, c="red")
     plt.xlabel("x")
     plt.ylabel("y")
     plt.axis("equal")