[recipes] tth: adds comment

recipes/tth.py

@@ -387,6 +387,7 @@ class Base(common.NeutrinoBase, common.Base):
                 :, 2:
             ]
             # resort again to pt
+            # only takes two leading pT not b tagged
             w_dijet_cand = w_dijet_cand[ak.argsort(w_dijet_cand.pt, ascending=False)][:, :2]
             wj_tpl = ak.combinations(
                 w_dijet_cand,