update readme

networks/subch_base/README.md

@@ -1,8 +1,8 @@
 # subch_base
 
-This is the base of all subch networks. In addition to all the simplifications
-done in subch_simple, this network also excluded N14, F18, Ne21, and Na22.
+This network is a further simplification of subch_simple by
+excluding N14, F18, Ne21, and Na22.
 These nuclei were added to include n14(a, g)f18(a, p)ne21 rate sequence,
 which allows an enhancement to the c12(p, g)n13(a, p)o16 rate due to the
 proton release. However, we find that the effect is not very significant,
-and can be approximated out.
+and they also caused an artificial endpoint at Na22.