diff --git a/README.md b/README.md
index 66aac25..2a7d860 100644
--- a/README.md
+++ b/README.md
@@ -83,7 +83,7 @@ names are case-insensitive. See the
 parameter reference per endpoint.
 
 ```php
-$client->get_market_news(['q' => 'apple', 'symbol' => 'AAPL']);
+$client->get_market_news(['q' => 'apple', 'market_id' => 'AAPL']);
 
 $client->get_news_count([
     'from_date' => '2024-01-01',
diff --git a/examples/count_api.php b/examples/count_api.php
index 88af629..7faec1c 100644
--- a/examples/count_api.php
+++ b/examples/count_api.php
@@ -18,7 +18,7 @@
 try {
     $news   = $newsdataApiObj->get_news_count($base + ['q' => 'election']);
     $crypto = $newsdataApiObj->get_crypto_count($base + ['coin' => 'btc']);
-    $market = $newsdataApiObj->get_market_count($base + ['symbol' => 'AAPL']);
+    $market = $newsdataApiObj->get_market_count($base + ['market_id' => 'AAPL']);
 
     var_dump($news, $crypto, $market);
 } catch (NewsdataException $e) {
diff --git a/examples/market_api.php b/examples/market_api.php
index 8cd4803..7ab6d79 100644
--- a/examples/market_api.php
+++ b/examples/market_api.php
@@ -9,8 +9,8 @@
 $newsdataApiObj = new NewsdataApi(NEWSDATA_API_KEY);
 
 $data = [
-    'q'      => 'apple',
-    'symbol' => 'AAPL',
+    'q'         => 'apple',
+    'market_id' => 'AAPL',
 ];
 
 try {
diff --git a/src/Constants.php b/src/Constants.php
index 845626f..a608113 100644
--- a/src/Constants.php
+++ b/src/Constants.php
@@ -121,7 +121,7 @@ final class Constants
             'excludecountry', 'domain', 'domainurl', 'excludedomain', 'language',
             'excludelanguage', 'prioritydomain', 'timezone', 'timeframe', 'size',
             'full_content', 'image', 'video', 'page', 'tag', 'sentiment',
-            'excludefield', 'removeduplicate', 'organization', 'symbol', 'id', 'url',
+            'excludefield', 'removeduplicate', 'organization', 'market_id', 'id', 'url',
             'sort', 'creator', 'datatype', 'sentiment_score',
         ],
         'count' => [
@@ -142,7 +142,7 @@ final class Constants
             'from_date', 'to_date', 'q', 'qintitle', 'qinmeta', 'country',
             'excludecountry', 'domain', 'domainurl', 'excludedomain', 'language',
             'excludelanguage', 'full_content', 'image', 'video', 'organization',
-            'symbol', 'prioritydomain', 'page', 'sentiment', 'removeduplicate', 'size',
+            'market_id', 'prioritydomain', 'page', 'sentiment', 'removeduplicate', 'size',
             'sort', 'tag', 'interval', 'creator', 'datatype', 'sentiment_score',
         ],
     ];