diff --git a/tractor/ipc/_ringbuf/_pubsub.py b/tractor/ipc/_ringbuf/_pubsub.py
index a41a83dd..94ce7460 100644
--- a/tractor/ipc/_ringbuf/_pubsub.py
+++ b/tractor/ipc/_ringbuf/_pubsub.py
@@ -1,3 +1,22 @@
+# 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/>.
+'''
+Ring buffer ipc publish-subscribe mechanism brokered by ringd
+can dynamically add new outputs (publisher) or inputs (subscriber)
+'''
 import time
 from abc import (
     ABC,
diff --git a/tractor/ipc/_ringbuf/_ringd.py b/tractor/ipc/_ringbuf/_ringd.py
index fb255979..a35de84b 100644
--- a/tractor/ipc/_ringbuf/_ringd.py
+++ b/tractor/ipc/_ringbuf/_ringd.py
@@ -1,3 +1,28 @@
+# 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/>.
+'''
+Actor to broker ringbuf resources, creates and allocates
+the resources, then automatically does fd passing.
+
+call open_ringd in your root actor
+
+then on actors that need a ringbuf resource use
+
+open_ringbuf acm, will automatically contact ringd.
+'''
 import os
 import tempfile
 from pathlib import Path
diff --git a/tractor/linux/_fdshare.py b/tractor/linux/_fdshare.py
index a1ddceec..82dd0e69 100644
--- a/tractor/linux/_fdshare.py
+++ b/tractor/linux/_fdshare.py
@@ -1,3 +1,18 @@
+# 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/>.
 '''
 Re-Impl of multiprocessing.reduction.sendfds & recvfds,
 using acms and trio
diff --git a/tractor/linux/eventfd.py b/tractor/linux/eventfd.py
index 0c05260e..f262c051 100644
--- a/tractor/linux/eventfd.py
+++ b/tractor/linux/eventfd.py
@@ -14,7 +14,7 @@
 # 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/>.
 '''
-Linux specifics, for now we are only exposing EventFD
+Expose libc eventfd APIs
 
 '''
 import os