diff --git a/netneurotools/plotting/pyvista_plotters.py b/netneurotools/plotting/pyvista_plotters.py
index 0012f81..a97cd0d 100644
--- a/netneurotools/plotting/pyvista_plotters.py
+++ b/netneurotools/plotting/pyvista_plotters.py
@@ -140,7 +140,7 @@ def pv_plot_surface(
         Colorbar limits. If None, will be set to 2.5th and 97.5th percentiles.
         Default is None.
     zoom_ratio : float, optional
-        Zoom ratio for the camera. Default is 1.0.
+        Zoom-in ratio for the camera. Default is 1.0.
     show_colorbar : bool, optional
         Whether to show the colorbar. Default is True.
     cbar_title : str, optional
diff --git a/netneurotools/spatial/spatial_stats.py b/netneurotools/spatial/spatial_stats.py
index 54baddf..b2884ed 100644
--- a/netneurotools/spatial/spatial_stats.py
+++ b/netneurotools/spatial/spatial_stats.py
@@ -1,9 +1,12 @@
 """Functions for calculating spatial statistics."""
 
+import numpy as np
+
 
 def morans_i():
     """Calculate Moran's I for spatial autocorrelation."""
-    pass
+    a = np.array([1, 2, 3])
+    return a
 
 
 def local_morans_i():