diff --git a/examples/plot_redundancy.py b/examples/plot_redundancy.py
index 3d2e003..9649794 100644
--- a/examples/plot_redundancy.py
+++ b/examples/plot_redundancy.py
@@ -159,6 +159,7 @@ def get_n_missed(
 N_REPEATED = 10
 
 selector_dict = {
+    # Smaller `tol` makes fastcan more sensitive to redundancy
     "fastcan": FastCan(N_SELECTED, tol=1e-7, verbose=0),
     "skb_reg": SelectKBest(f_regression, k=N_SELECTED),
     "skb_mir": SelectKBest(mutual_info_regression, k=N_SELECTED),