diff --git a/docs/row-expand.md b/docs/row-expand.md
index 8afb1aa..5de4f7b 100644
--- a/docs/row-expand.md
+++ b/docs/row-expand.md
@@ -92,13 +92,15 @@ const expandRow = {
 ```
 
 ### <a name='expandColumnRenderer'>expandRow.expandColumnRenderer - [Function]</a>
-Provide a callback function which allow you to custom the expand indicator. This callback only have one argument which is an object and contain one property  `expanded` which indicate if current row is expanded
+Provide a callback function which allow you to custom the expand indicator. This callback only have one argument which is an object and contain two properties:
+* `expanded`: Indicate if current row is expanded or not
+* `rowKey`: Current row key
 
 
 ```js
 const expandRow = {
   renderer: (row) => ...
-  expandColumnRenderer: ({ expanded }) => (
+  expandColumnRenderer: ({ expanded, rowKey }) => (
     // ....
   )
 };
diff --git a/packages/react-bootstrap-table2-example/examples/row-expand/custom-expand-column.js b/packages/react-bootstrap-table2-example/examples/row-expand/custom-expand-column.js
index 067046d..b1ed8c1 100644
--- a/packages/react-bootstrap-table2-example/examples/row-expand/custom-expand-column.js
+++ b/packages/react-bootstrap-table2-example/examples/row-expand/custom-expand-column.js
@@ -1,4 +1,5 @@
 /* eslint react/prop-types: 0 */
+/* eslint no-unused-vars: 0 */
 import React from 'react';
 
 import BootstrapTable from 'react-bootstrap-table-next';
@@ -33,7 +34,7 @@ const expandRow = {
     }
     return <b>+</b>;
   },
-  expandColumnRenderer: ({ expanded }) => {
+  expandColumnRenderer: ({ expanded, rowKey }) => {
     if (expanded) {
       return (
         <b>-</b>
diff --git a/packages/react-bootstrap-table2/src/row-expand/expand-cell.js b/packages/react-bootstrap-table2/src/row-expand/expand-cell.js
index 5aa33f5..64b088e 100644
--- a/packages/react-bootstrap-table2/src/row-expand/expand-cell.js
+++ b/packages/react-bootstrap-table2/src/row-expand/expand-cell.js
@@ -38,7 +38,7 @@ export default class ExpandCell extends Component {
   }
 
   render() {
-    const { expanded, expandColumnRenderer, tabIndex } = this.props;
+    const { expanded, expandColumnRenderer, tabIndex, rowKey } = this.props;
     const attrs = {};
     if (tabIndex !== -1) attrs.tabIndex = tabIndex;
 
@@ -46,7 +46,8 @@ export default class ExpandCell extends Component {
       <td onClick={ this.handleClick } { ...attrs }>
         {
           expandColumnRenderer ? expandColumnRenderer({
-            expanded
+            expanded,
+            rowKey
           }) : (expanded ? '(-)' : '(+)')
         }
       </td>