diff --git a/README.md b/README.md
index 12c20ea..060b0b8 100644
--- a/README.md
+++ b/README.md
@@ -67,6 +67,17 @@ php src/cli/index/init.php [reset]
 ```
 * `reset` - optional, reset existing index
 
+##### Alter
+
+Change existing index
+
+```
+php src/cli/index/alter.php {operation} {column} {type}
+```
+* `operation` - operation name, supported values: `add`|`drop`
+* `column` - target column name
+* `type` - target column type, supported values: `text`|`integer`
+
 #### Document
 
 ##### Add
diff --git a/src/cli/index/alter.php b/src/cli/index/alter.php
index a4a3fb6..c572ac5 100644
--- a/src/cli/index/alter.php
+++ b/src/cli/index/alter.php
@@ -1,4 +1,99 @@
 <?php
 
-// @TODO
-// https://github.com/manticoresoftware/manticoresearch-php/blob/master/docs/indexclass.md#alter
\ No newline at end of file
+// Load dependencies
+require_once __DIR__ . '/../../../vendor/autoload.php';
+
+// Init config
+$config = json_decode(
+    file_get_contents(
+        __DIR__ . '/../../../config.json'
+    )
+);
+
+// Init client
+$client = new \Manticoresearch\Client(
+    [
+        'host' => $config->manticore->server->host,
+        'port' => $config->manticore->server->port,
+    ]
+);
+
+// Init index
+$index = $client->index(
+    $config->manticore->index->document->name
+);
+
+// Validate request
+if (empty($argv[1]))
+{
+    exit(
+        _('Operation name required!') . PHP_EOL
+    );
+}
+
+if (empty($argv[2]))
+{
+    exit(
+        _('Operated column required!') . PHP_EOL
+    );
+}
+
+if ($argv[1] == 'add')
+{
+    if (empty($argv[3]))
+    {
+        exit(
+            _('Operated column type required!') . PHP_EOL
+        );
+    }
+
+    if (!in_array($argv[3], ['integer', 'text']))
+    {
+        exit(
+            _('Undefined column type!') . PHP_EOL
+        );
+    }
+}
+
+// Route query
+switch ($argv[1])
+{
+    case 'add':
+
+        if ($result = $index->alter($argv[1], $argv[2], $argv[3]))
+        {
+            echo sprintf(
+                'row "%s" with type "%s" successfully added to index "%s" with result: %s' . PHP_EOL,
+                $argv[2],
+                $argv[3],
+                $config->manticore->index->document->name,
+                print_r(
+                    $result,
+                    true
+                )
+            );
+        }
+
+    break;
+
+    case 'drop':
+
+        if ($result = $index->alter($argv[1], $argv[2]))
+        {
+            echo sprintf(
+                'row "%s" successfully deleted from index "%s" with result: %s' . PHP_EOL,
+                $argv[2],
+                $config->manticore->index->document->name,
+                print_r(
+                    $result,
+                    true
+                )
+            );
+        }
+
+    break;
+
+    default:
+
+        echo _('Unknown operation!') . PHP_EOL;
+}
\ No newline at end of file