diff --git a/modules/juce_events/native/juce_linux_EventLoop.h b/modules/juce_events/native/juce_linux_EventLoop.h
index 58122d9687..752a50dcdd 100644
--- a/modules/juce_events/native/juce_linux_EventLoop.h
+++ b/modules/juce_events/native/juce_linux_EventLoop.h
@@ -1,3 +1,33 @@
+/*
+  ==============================================================================
+
+   This file is part of the JUCE library.
+   Copyright (c) 2017 - ROLI Ltd.
+
+   Permission is granted to use this software under the terms of the ISC license
+   http://www.isc.org/downloads/software-support-policy/isc-license/
+
+   Permission to use, copy, modify, and/or distribute this software for any
+   purpose with or without fee is hereby granted, provided that the above
+   copyright notice and this permission notice appear in all copies.
+
+   THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH REGARD
+   TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+   FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT,
+   OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
+   USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+   TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+   OF THIS SOFTWARE.
+
+   -----------------------------------------------------------------------------
+
+   To release a closed-source product which uses other parts of JUCE not
+   licensed under the ISC terms, commercial licenses are available: visit
+   www.juce.com for more information.
+
+  ==============================================================================
+*/
+
 #pragma once
 
 namespace LinuxEventLoop
diff --git a/modules/juce_gui_basics/native/juce_linux_X11.cpp b/modules/juce_gui_basics/native/juce_linux_X11.cpp
index 2f9c440669..09f377af92 100644
--- a/modules/juce_gui_basics/native/juce_linux_X11.cpp
+++ b/modules/juce_gui_basics/native/juce_linux_X11.cpp
@@ -1,3 +1,27 @@
+/*
+  ==============================================================================
+
+   This file is part of the JUCE library.
+   Copyright (c) 2017 - ROLI Ltd.
+
+   Permission is granted to use this software under the terms of either:
+   a) the GPL v2 (or any later version)
+   b) the Affero GPL v3
+
+   Details of these licenses can be found at: www.gnu.org/licenses
+
+   JUCE 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 General Public License for more details.
+
+   ------------------------------------------------------------------------------
+
+   To release a closed-source product which uses JUCE, commercial licenses are
+   available: visit www.juce.com for more information.
+
+  ==============================================================================
+*/
+
 typedef void (*WindowMessageReceiveCallback) (XEvent&);
 WindowMessageReceiveCallback dispatchWindowMessage = nullptr;
 
diff --git a/modules/juce_gui_basics/native/juce_linux_X11.h b/modules/juce_gui_basics/native/juce_linux_X11.h
index 176b2b387c..6efc9269e3 100644
--- a/modules/juce_gui_basics/native/juce_linux_X11.h
+++ b/modules/juce_gui_basics/native/juce_linux_X11.h
@@ -1,3 +1,27 @@
+/*
+  ==============================================================================
+
+   This file is part of the JUCE library.
+   Copyright (c) 2017 - ROLI Ltd.
+
+   Permission is granted to use this software under the terms of either:
+   a) the GPL v2 (or any later version)
+   b) the Affero GPL v3
+
+   Details of these licenses can be found at: www.gnu.org/licenses
+
+   JUCE 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 General Public License for more details.
+
+   ------------------------------------------------------------------------------
+
+   To release a closed-source product which uses JUCE, commercial licenses are
+   available: visit www.juce.com for more information.
+
+  ==============================================================================
+*/
+
 #pragma once
 
 // Hack to forward declare _XDisplay outside the