diff --git a/modules/util/acspo_validate.py b/modules/util/acspo_validate.py
index 3b0a3ae8953503c47e5d7453d33451c0f9053b1f..4ce224ad4ca9dec107569e87e1cedc0e62b209d2 100644
--- a/modules/util/acspo_validate.py
+++ b/modules/util/acspo_validate.py
@@ -62,6 +62,8 @@ def acspo_validate(oper_file, cspp_file, rel_tol=0.001, outfile_nc=None):
     start_idx_oper, stop_idx_oper = -1, -1
     start_idx_cspp, stop_idx_cspp = -1, -1
 
+    # Average latitude spacing: 0.00652 deg
+
     for k in range(len(cntr_lat_oper)):
         c_a = np.logical_and(np.isclose(cntr_lat_oper[k], cntr_lat_cspp), np.isclose(cntr_lon_oper[k], cntr_lon_cspp))
         if np.size(np.nonzero(c_a)[0]) == 1: