diff --git a/files_opds/admin.php b/files_opds/admin.php
index 8242395..f930245 100644
--- a/files_opds/admin.php
+++ b/files_opds/admin.php
@@ -26,6 +26,7 @@ $formats = array(
 $tmpl = new \OCP\Template('files_opds', 'admin');
 $tmpl->assign('feedSubtitle', Config::getApp('feed-subtitle', $l->t("%s OPDS catalog", $defaults->getName())));
 $tmpl->assign('isbndbKey', Config::getApp('isbndb-key', ''));
+$tmpl->assign('googleKey', Config::getApp('google-key', ''));
 $tmpl->assign('previewFormats', $formats);
 $tmpl->assign('cover-x', Config::getApp('cover-x', '200'));
 $tmpl->assign('cover-y', Config::getApp('cover-y', '200'));
diff --git a/files_opds/ajax/admin.php b/files_opds/ajax/admin.php
index 91d8a48..500db12 100644
--- a/files_opds/ajax/admin.php
+++ b/files_opds/ajax/admin.php
@@ -26,6 +26,7 @@ if (isset($_POST['opdsCoverX'])) {
 	$opdsThumbY = isset($_POST['opdsThumbY']) ? (int) $_POST['opdsThumbY'] : 36;
 	$opdsFeedSubtitle = isset($_POST['opdsFeedSubtitle']) ? $_POST['opdsFeedSubtitle'] : $l->t("%s OPDS catalog", $defaults->getName());
 	$opdsIsbndbKey = isset($_POST['opdsIsbndbKey']) ? $_POST['opdsIsbndbKey'] : '';
+	$opdsGoogleKey = isset($_POST['opdsGoogleKey']) ? $_POST['opdsGoogleKey'] : '';
 
 	Config::setApp('cover-x', $opdsCoverX);
 	Config::setApp('cover-y', $opdsCoverY);
@@ -33,6 +34,7 @@ if (isset($_POST['opdsCoverX'])) {
 	Config::setApp('thumb-y', $opdsThumbX);
 	Config::setApp('feed_subtitle', $opdsFeedSubtitle);
 	Config::setApp('isbndb-key', $opdsIsbndbKey);
+	Config::setApp('google-key', $opdsGoogleKey);
 } else {
 	// set preview preferences
 	$opdsPreviewEpub = $_POST['opdsPreviewEpub'];
diff --git a/files_opds/js/admin.js b/files_opds/js/admin.js
index dd95ca7..4b1ecc8 100644
--- a/files_opds/js/admin.js
+++ b/files_opds/js/admin.js
@@ -28,7 +28,8 @@ $(document).ready(function(){
                                 opdsThumbX : $('#opds-thumb-x').val(),
                                 opdsThumbY : $('#opds-thumb-y').val(),
 				opdsFeedSubtitle : $('#opds-feed-subtitle').val(),
-				opdsIsbndbKey : $('#opds-isbndb-key').val()
+				opdsIsbndbKey : $('#opds-isbndb-key').val(),
+				opdsGoogleKey : $('#opds-google-key').val()
                         };
                         OC.msg.startSaving('#opds-admin .msg');
                         $.post(OC.filePath('files_opds', 'ajax', 'admin.php'), data, opdsAdminCoverSettings.afterSave);
@@ -43,8 +44,8 @@ $(document).ready(function(){
         $('#opds-preview-opendocument').on("change", opdsAdminSettings.save);
         $('#opds-preview-msoffice').on("change", opdsAdminSettings.save);
 
-        $('#opds-cover-x,#opds-cover-y,#opds-thumb-x,#opds-thumb-y,#opds-feed-subtitle,#opds-isbndb-key').blur(opdsAdminCoverSettings.save);
-        $('#opds-cover-x,#opds-cover-y,#opds-thumb-x,#opds-thumb-y,#opds-feed-subtitle,#opds-isbndb-key').keypress(function( event ) {
+        $('#opds-cover-x,#opds-cover-y,#opds-thumb-x,#opds-thumb-y,#opds-feed-subtitle,#opds-isbndb-key,#opds-google-key').blur(opdsAdminCoverSettings.save);
+        $('#opds-cover-x,#opds-cover-y,#opds-thumb-x,#opds-thumb-y,#opds-feed-subtitle,#opds-isbndb-key,#opds-google-key').keypress(function( event ) {
                                                 if (event.which == 13) {
                                                   event.preventDefault();
                                                   opdsAdminCoverSettings.save();
diff --git a/files_opds/lib/google.php b/files_opds/lib/google.php
index 43ed113..2fe5752 100644
--- a/files_opds/lib/google.php
+++ b/files_opds/lib/google.php
@@ -25,7 +25,12 @@ class Google
          * @return int $status (0 on success, ERRORCODE otherwise)
          */
         public static function get($isbn,&$meta) {
-                $command = 'https://www.googleapis.com/books/v1/volumes?q=isbn:' . $isbn;
+               	$command = 'https://www.googleapis.com/books/v1/volumes?q=isbn:' . $isbn;
+		if ($keyString = Config::getApp('google-key','')) {
+			$keys = explode(',', $keyString);
+			$key = $keys[rand(0,count($keys) - 1)];
+			$command .= '&key=' . $key;
+		}
                 $data = json_decode(file_get_contents($command),true);
                 if($data['totalItems'] > 0) {
 			self::parse($data['items'][0]['volumeInfo'],$meta);
diff --git a/files_opds/templates/admin.php b/files_opds/templates/admin.php
index 1ac0a2e..9088cce 100644
--- a/files_opds/templates/admin.php
+++ b/files_opds/templates/admin.php
@@ -36,6 +36,10 @@ function checkBox($format) {
                 <td><label for="opds-isbndb-key"><?php p($l->t('ISBNdb key:')) ?></label></td>
                 <td><input type="text" id="opds-isbndb-key" title="<?php p($l->t("Enter ISBNdb key to use for metadata lookup. Leave blank to disable ISBNdb lookup.")); ?>" value="<?php p($_['isbndbKey']) ?>" /></td>
         </tr>
+        <tr>
+                <td><label for="opds-google-key"><?php p($l->t('Google Books API key:')) ?></label></td>
+                <td><input type="text" id="opds-google-key" title="<?php p($l->t("Enter Google Books API key to use for metadata lookup. Even though metadata lookup will work without an API key, the rate limit is higher when a key is used.")); ?>" value="<?php p($_['googleKey']) ?>" /></td>
+        </tr>
 	</table>
 	<br>
 	<p><?php p($l->t('Enable preview for:')); ?></p>