diff --git a/README.md b/README.md
index c900518e3e99ecec7a4e2b5ea2b89e38019353c1..67495ab2419fa61cc516381d42b670250620b4c5 100644
--- a/README.md
+++ b/README.md
@@ -42,6 +42,8 @@ The following information must be provided in the input file (```input0``):
 8. ξ
 9. Θ
 
+<i>OBS: By "Q-value" we mean the maximum kinetic energy of the $`\beta`$ particle for zero excitation energy in the daughter nucleus.</i>
+
 The example input file is for simulating beta-delayed alpha emission from 8B assuming 3.0 MeV excitation energy in 8Be. a3 is the so-called triple-correlation coefficient which equals -1 for pure Gamow-Teller decays, +1 for pure Fermi decays and takes on values between -1 and +1 for mixed decays. 
 ξ and Θ are spin-dependent coefficients given by the [these formulas](https://git.kern.phys.au.dk/oliskir/bedepe/blob/master/spincoeff.pdf).