diff --git a/index.d.ts b/index.d.ts
index 7c0e6e5..0a6f6d8 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -97,7 +97,7 @@ interface GroupRendererProps {
 
 export interface FilteringContainerProps {
   nodes: Node[];
-  children: (params: {nodes: Node[]; nodeParentMappings: {[id: NodeId]: NodeId[]}}) => JSX.Element;
+  children: (params: {nodes: Node[]; nodeParentMappings: {[key in NodeId]: NodeId[]}}) => JSX.Element;
   debouncer?: (func: (...p: any[]) => any, timeout: number) => void;
   groups?: {[g: string]: Group};
   selectedGroup?: string;
diff --git a/src/FilteringContainer.js b/src/FilteringContainer.js
index d0f0b9f..2580765 100644
--- a/src/FilteringContainer.js
+++ b/src/FilteringContainer.js
@@ -32,6 +32,7 @@ export default class FilteringContainer extends React.Component {
     debouncer: debounce,
     groupRenderer: DefaultGroupRenderer,
     indexSearch: indexByName,
+    placeholder: 'Search...',
   };
 
   constructor(props) {
@@ -62,6 +63,7 @@ export default class FilteringContainer extends React.Component {
       groupRenderer: GroupRenderer,
       onSelectedGroupChange,
       indexSearch,
+      placeholder,
     } = this.props;
 
     const relevantNodes =
@@ -76,7 +78,7 @@ export default class FilteringContainer extends React.Component {
     return (
       <div className="tree-filter-container">
         <div className={classNames('tree-lookup-input', {group: !!groups})}>
-          <input value={filterText} onChange={this.handleFilterTextChange} placeholder="Search..." />
+          <input value={filterText} onChange={this.handleFilterTextChange} placeholder={placeholder} />
           <i aria-hidden="true" className="mi mi-11 mi-search" />
           {groups && <GroupRenderer groups={groups} selectedGroup={selectedGroup} onChange={onSelectedGroupChange} />}
         </div>
@@ -94,4 +96,5 @@ FilteringContainer.propTypes = {
   groupRenderer: PropTypes.func,
   onSelectedGroupChange: PropTypes.func,
   indexSearch: PropTypes.func,
+  placeholder: PropTypes.string,
 };
diff --git a/src/__tests__/FilteringContainer.test.js b/src/__tests__/FilteringContainer.test.js
index c23add9..b4f0714 100644
--- a/src/__tests__/FilteringContainer.test.js
+++ b/src/__tests__/FilteringContainer.test.js
@@ -82,6 +82,18 @@ describe('FilteringContainer', () => {
 
       expect(getInjectedNodes()).toMatchSnapshot();
     });
+
+    it('should render with the default placeholder', () => {
+      const {wrapper} = setup();
+
+      expect(wrapper.getByPlaceholderText('Search...')).not.toBeNull();
+    });
+
+    it('should render the expected placeholder', () => {
+      const {wrapper} = setup({placeholder: 'Custom Placeholder'});
+
+      expect(wrapper.getByPlaceholderText('Custom Placeholder')).not.toBeNull();
+    });
   });
 
   describe('groups', () => {