diff --git a/src/resizer/distributors.js b/src/resizer/distributors.js
index dbc35fc6c9..93a75d474e 100644
--- a/src/resizer/distributors.js
+++ b/src/resizer/distributors.js
@@ -1,3 +1,19 @@
+/*
+Copyright 2018 New Vector Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
 class FixedDistributor {
     constructor(sizer, item, config) {
         this.sizer = sizer;
diff --git a/src/resizer/index.js b/src/resizer/index.js
index 4b335ce4a4..f0c5878a1d 100644
--- a/src/resizer/index.js
+++ b/src/resizer/index.js
@@ -1,3 +1,19 @@
+/*
+Copyright 2018 New Vector Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
 import {Sizer} from "./sizer";
 import {FixedDistributor, CollapseDistributor, PercentageDistributor} from "./distributors";
 import {Resizer} from "./resizer";
diff --git a/src/resizer/resizer.js b/src/resizer/resizer.js
index dc74b5b699..8888287b86 100644
--- a/src/resizer/resizer.js
+++ b/src/resizer/resizer.js
@@ -1,3 +1,19 @@
+/*
+Copyright 2018 New Vector Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
 import {Sizer} from "./sizer";
 
 /*
diff --git a/src/resizer/room.js b/src/resizer/room.js
index 0080cca3eb..a6ad0b5dc2 100644
--- a/src/resizer/room.js
+++ b/src/resizer/room.js
@@ -1,3 +1,19 @@
+/*
+Copyright 2018 New Vector Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
 import {Sizer} from "./sizer";
 import {FixedDistributor} from "./distributors";
 
diff --git a/src/resizer/sizer.js b/src/resizer/sizer.js
index 2dc116714f..b39aaea286 100644
--- a/src/resizer/sizer.js
+++ b/src/resizer/sizer.js
@@ -1,3 +1,19 @@
+/*
+Copyright 2018 New Vector Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
 class Sizer {
     constructor(container, vertical, reverse) {
         this.container = container;