diff --git a/tractor/to_asyncio.py b/tractor/to_asyncio.py
index 6ad8bf5..9b18a87 100644
--- a/tractor/to_asyncio.py
+++ b/tractor/to_asyncio.py
@@ -1,3 +1,19 @@
+# tractor: structured concurrent "actors".
+# Copyright 2018-eternity Tyler Goodlet.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
 '''
 Infection apis for ``asyncio`` loops running ``trio`` using guest mode.