improve documentation of _element_constructor_

sagemath · Sep 29, 2015 · dc00f95 · dc00f95
1 parent 5cf2a31
commit dc00f95
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/src/sage/rings/asymptotic/asymptotic_ring.py b/src/sage/rings/asymptotic/asymptotic_ring.py
@@ -993,6 +993,12 @@ def _element_constructor_(self, data, summands=None, simplify=True):
 
         An element of this asymptotic ring.
 
+        .. NOTE::
+
+            Either ``data`` or ``summands`` has to be given. If
+            ``summands`` is specified, then no positional argument
+            may be passed (except for `int(0)`).
+
         TESTS::
 
             sage: AR = AsymptoticRing(growth_group='x^ZZ', coefficient_ring=ZZ)