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diff --git a/TODO b/TODO
index 5a55e11..9359698 100644
--- a/TODO
+++ b/TODO
@@ -35,3 +35,4 @@
 - add shower PDF to get_total_charge_approx()
 - compute mean of starting points
 - speed up time PDF calculation for fast likelihood
+- calculate psi parameter as a goodness of fit test