diff --git a/bot/interfaces.go b/bot/interfaces.go
index bd79bec..2a736bc 100644
--- a/bot/interfaces.go
+++ b/bot/interfaces.go
@@ -1,3 +1,5 @@
+// © 2016 the CatBase Authors under the WTFPL license. See AUTHORS for the list of authors.
+
 package bot
 
 type Connector interface {
diff --git a/irc/irc.go b/irc/irc.go
index 5267c45..5c22fc6 100644
--- a/irc/irc.go
+++ b/irc/irc.go
@@ -1,3 +1,5 @@
+// © 2016 the CatBase Authors under the WTFPL license. See AUTHORS for the list of authors.
+
 package irc
 
 import (
diff --git a/slack/slack.go b/slack/slack.go
index eb05d0a..63bb63f 100644
--- a/slack/slack.go
+++ b/slack/slack.go
@@ -1,3 +1,5 @@
+// © 2016 the CatBase Authors under the WTFPL license. See AUTHORS for the list of authors.
+
 // Package slack connects to slack service
 package slack