diff --git a/src/operations/balanceChart.component.ts b/src/operations/balanceChart.component.ts
index 3c4e6a6..ccf7371 100644
--- a/src/operations/balanceChart.component.ts
+++ b/src/operations/balanceChart.component.ts
@@ -40,8 +40,9 @@ export class BalanceChartComponent implements OnChanges {
   public data;
 
   public xAxis: any = {
-    dataField: 'operation_date',
     type: 'date',
+    dataField: 'operation_date',
+    displayText: 'Date',
     baseUnit: 'day',
 
     rangeSelector: {
@@ -80,15 +81,18 @@ export class BalanceChartComponent implements OnChanges {
     },
     series: [{
       dataField: 'expenses',
+      displayText: 'Expenses',
       fillColor: 'red'
     }, {
       dataField: 'revenues',
+      displayText: 'Revenues',
       fillColor: 'green'
     }]
   }, {
     type: 'line',
     series: [{
       dataField: 'balance',
+      displayText: 'Balance',
       fillColor: 'blue'
     }],
     bands: [{