diff --git a/message_ix/report/__init__.py b/message_ix/report/__init__.py
index 3b72aa006..6db4f17fe 100644
--- a/message_ix/report/__init__.py
+++ b/message_ix/report/__init__.py
@@ -121,7 +121,6 @@
     ("emi:nl-t-ya-m-e", dict(kind="emi", var="emis")),
 ]
 
-#: Automatic reports that :func:`~genno.operator.concat` quantities converted to IAMC
 #: format.
 TASKS1 = (
     (
@@ -141,7 +140,6 @@
         "message::costs",
         "message::emissions",
     ),
-    ("message::sankey", "concat", "out::pyam", "in::pyam"),
 )