--- ray/doc/notes/ReleaseNotes	2021/03/12 18:32:33	1.388
+++ ray/doc/notes/ReleaseNotes	2021/04/05 19:56:18	1.390
@@ -2425,3 +2425,10 @@ Put cap on maximum ambient gradient to avoid over-extr
 poorly computed irradiance cache values.
 
 Added robjutil +T option to triangulate all faces in .OBJ description.
+
+Altered BSDF library to have both front and back diffuse transmittance
+values, which can be different.  This was necessary to avoid issues
+caused by measurement and modeling discrepancies.
+
+Added pabopto2bsdf -g option to cull near-grazing scattering to avoid
+issues with noise and negative values.