diff --git a/examples/PARAM/hcana.param b/examples/PARAM/hcana.param
index 6d3295a3a54711f41f723fa9be39a9059221562d..e4c572f1d41d44d467c1eae590fed24e889eff05 100644
--- a/examples/PARAM/hcana.param
+++ b/examples/PARAM/hcana.param
@@ -7,6 +7,9 @@ hhodo_num_planes = 4
 
 hcal_num_layers = 4
 
+# Exclusion band width for the calorimeter's fiducial volume.
+hcal_fv_delta = 5.0
+
 haero_num_pairs = 8
 
 # Names of planes so that parameter names can be constructed