add comment in code to make it clear what happens

sagemath · Sep 21, 2015 · a49a20d · a49a20d
1 parent 7af4b6b
commit a49a20d
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/src/sage/data_structures/mutable_poset.py b/src/sage/data_structures/mutable_poset.py
@@ -2010,6 +2010,8 @@ def add(self, element):
         smaller = self.null.covers(new, reverse=False)
         larger = self.oo.covers(new, reverse=True)
 
+        # In the following we first search towards oo (reverse=False) and
+        # then towards null (reverse=True; everything is "inverted").
         for reverse in (False, True):
             sm = smaller if not reverse else larger
             la = larger if not reverse else smaller