diff --git a/docs/UsingMatchers.md b/docs/UsingMatchers.md
index bb21bb3fbd59..d6fab01b4dc9 100644
--- a/docs/UsingMatchers.md
+++ b/docs/UsingMatchers.md
@@ -117,9 +117,9 @@ test('but there is a "stop" in Christoph', () => {
 });
 ```
 
-## Arrays
+## Arrays and iterables
 
-You can check if an array contains a particular item using `toContain`:
+You can check if an array or iterable contains a particular item using `toContain`:
 
 ```js
 const shoppingList = [
@@ -132,6 +132,7 @@ const shoppingList = [
 
 test('the shopping list has beer on it', () => {
   expect(shoppingList).toContain('beer');
+  expect(new Set(shoppingList)).toContain('beer');
 });
 ```
 
diff --git a/website/versioned_docs/version-22.x/UsingMatchers.md b/website/versioned_docs/version-22.x/UsingMatchers.md
index 87b15b921c6e..001537780915 100644
--- a/website/versioned_docs/version-22.x/UsingMatchers.md
+++ b/website/versioned_docs/version-22.x/UsingMatchers.md
@@ -118,9 +118,9 @@ test('but there is a "stop" in Christoph', () => {
 });
 ```
 
-## Arrays
+## Arrays and iterables
 
-You can check if an array contains a particular item using `toContain`:
+You can check if an array or iterable contains a particular item using `toContain`:
 
 ```js
 const shoppingList = [
@@ -133,6 +133,7 @@ const shoppingList = [
 
 test('the shopping list has beer on it', () => {
   expect(shoppingList).toContain('beer');
+  expect(new Set(shoppingList)).toContain('beer');
 });
 ```