diff --git a/accountant/frontend/static/js/operations.js b/accountant/frontend/static/js/operations.js
index ae802b9..b8eeae5 100644
--- a/accountant/frontend/static/js/operations.js
+++ b/accountant/frontend/static/js/operations.js
@@ -14,6 +14,7 @@
     You should have received a copy of the GNU Affero General Public License
     along with Accountant.  If not, see <http://www.gnu.org/licenses/>.
  */
+// vim: set tw=80 ts=2 sw=2 sts=2:
 accountantApp
 
 .factory("Operation", [ "$resource", function($resource)  {
@@ -24,6 +25,9 @@ accountantApp
     );
 }])
 
+/*
+ * Controller for category chart.
+ */
 .controller(
   "CategoryChartController", [
     "$rootScope", "$scope", "$http", "$routeParams",
@@ -167,6 +171,9 @@ accountantApp
   });
 }])
 
+/*
+ * Controller for the sold chart.
+ */
 .controller(
   "SoldChartController", [
     "$rootScope", "$scope", "$http", "$routeParams",
@@ -306,15 +313,18 @@ accountantApp
   $scope.loadSolds();
 }])
 
+/*
+ * Controller for the operations.
+ */
 .controller(
     "OperationController", [
-        "$scope", "$http", "$rootScope", "$filter", "$routeParams", "notificationService", "Operation",
-        function($scope, $http, $rootScope, $filter, $routeParams, notificationService, Operation) {
-  // Operation store.
+        "$scope", "$rootScope", "$routeParams", "notificationService", "Operation",
+        function($scope, $rootScope, $routeParams, notificationService, Operation) {
+  // List of operations.
   $scope.operations = [];
 
   /*
-   * Add a new operation.
+   * Add an empty operation.
    */
   $scope.add = function() {
     var operation = new Operation({