diff --git a/docs/plot_fits.py b/docs/plot_fits.py
index a34ec19..3369e76 100644
--- a/docs/plot_fits.py
+++ b/docs/plot_fits.py
@@ -18,5 +18,5 @@
 import matplotlib.pyplot as plt
 from astropy.visualization.mpl_normalize import simple_norm
 ax = plt.subplot(projection=geometry.wcs)
-norm = simple_norm(image, 'sqrt')
+norm = simple_norm(image, 'sqrt', min_percent=1, max_percent=99)
 ax.imshow(image, origin='lower', norm=norm, cmap='gray')