diff --git a/lib/mixins/dir-mixin.js b/lib/mixins/dir-mixin.js
index 7d48fc4ff9..3237511791 100644
--- a/lib/mixins/dir-mixin.js
+++ b/lib/mixins/dir-mixin.js
@@ -1,4 +1,5 @@
 /**
+ * @fileoverview
  * @suppress {checkPrototypalTypes}
  * @license Copyright (c) 2017 The Polymer Project Authors. All rights reserved.
  * This code may only be used under the BSD style license found at
diff --git a/lib/mixins/disable-upgrade-mixin.js b/lib/mixins/disable-upgrade-mixin.js
index c363259ab5..a97aa9e9ba 100644
--- a/lib/mixins/disable-upgrade-mixin.js
+++ b/lib/mixins/disable-upgrade-mixin.js
@@ -1,4 +1,5 @@
 /**
+ * @fileoverview
  * @suppress {checkPrototypalTypes}
  * @license Copyright (c) 2017 The Polymer Project Authors. All rights reserved.
  * This code may only be used under the BSD style license found at
diff --git a/lib/mixins/element-mixin.js b/lib/mixins/element-mixin.js
index 06fea1a65e..c931fb7fc0 100644
--- a/lib/mixins/element-mixin.js
+++ b/lib/mixins/element-mixin.js
@@ -1,4 +1,5 @@
 /**
+ * @fileoverview
  * @suppress {checkPrototypalTypes}
  * @license Copyright (c) 2017 The Polymer Project Authors. All rights reserved.
  * This code may only be used under the BSD style license found at
diff --git a/lib/mixins/property-effects.js b/lib/mixins/property-effects.js
index daa371f496..c92bea3fa6 100644
--- a/lib/mixins/property-effects.js
+++ b/lib/mixins/property-effects.js
@@ -1,4 +1,5 @@
 /**
+ * @fileoverview
  * @suppress {checkPrototypalTypes}
  * @license Copyright (c) 2017 The Polymer Project Authors. All rights reserved.
  * This code may only be used under the BSD style license found at