Added note for K_b_r coefficient calculating function
@@ -195,6 +195,11 @@ def coefficient_K_B_r_Nayatani1997(L_a):
numeric or ndarray
:math:`K_B_r` coefficient for *Nayatani (1997)* HKE methods.
+ Notes
+ -----
+ The :math:`K_B_r` coefficient is normalised to unity around
+ :math:`63.66cd/m^2`.
+
References
----------
:cite:`nayatani1997`
