From d5ecd1a23b75f7e18f9c0e679e18c33765b17822 Mon Sep 17 00:00:00 2001
From: Martin Reinecke <martin@mpa-garching.mpg.de>
Date: Wed, 9 Jan 2019 13:34:37 +0100
Subject: [PATCH] more details

---
 nifty5/operators/simple_linear_operators.py | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/nifty5/operators/simple_linear_operators.py b/nifty5/operators/simple_linear_operators.py
index 79b95e793..656fcc092 100644
--- a/nifty5/operators/simple_linear_operators.py
+++ b/nifty5/operators/simple_linear_operators.py
@@ -131,6 +131,13 @@ def ducktape(left, right, name):
     - `left` and `right` must not be both `None`, but one of them can (and
       probably should) be `None`. In this case, the missing information is
       inferred.
+    - the returned operator's domains are
+        - a `DomainTuple` and
+        - a `MultiDomain` with exactly one entry called `name` and the same
+          `DomainTuple`
+
+      Which of these is the domain and which is the target depends on the
+      input.
 
     Returns
     -------
-- 
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