diff --git a/README.md b/README.md
index cc23395..a613796 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 [pgvector](https://github.com/pgvector/pgvector) support for PHP
 
-Supports [Laravel](https://github.com/laravel/laravel), [Doctrine](https://github.com/doctrine/orm), and [PgSql](https://www.php.net/manual/en/book.pgsql.php)
+Supports [Laravel](https://github.com/laravel/laravel), [Doctrine](https://github.com/doctrine/orm), [CodeIgniter](https://github.com/codeigniter4/CodeIgniter4), and [PgSql](https://www.php.net/manual/en/book.pgsql.php)
 
 [![Build Status](https://github.com/pgvector/pgvector-php/actions/workflows/build.yml/badge.svg)](https://github.com/pgvector/pgvector-php/actions)
 
@@ -12,6 +12,7 @@ Follow the instructions for your database library:
 
 - [Laravel](#laravel)
 - [Doctrine](#doctrine)
+- [CodeIgniter](#codeigniter)
 - [PgSql](#pgsql)
 
 Or check out some examples:
@@ -169,6 +170,10 @@ $neighbors = $entityManager->createQuery('SELECT i FROM Item i ORDER BY l2_dista
 
 Also supports `max_inner_product`, `cosine_distance`, `l1_distance`, `hamming_distance`, and `jaccard_distance`
 
+### CodeIgniter
+
+todo
+
 ### PgSql
 
 Enable the extension
diff --git a/composer.json b/composer.json
index 12db7a6..c93b8dd 100644
--- a/composer.json
+++ b/composer.json
@@ -23,6 +23,7 @@
         "php": ">= 8.1"
     },
     "require-dev": {
+        "codeigniter4/framework": "^4.5",
         "doctrine/dbal": "^4",
         "doctrine/orm": "^3",
         "phpunit/phpunit": "^10",
diff --git a/tests/CodeIgniterTest.php b/tests/CodeIgniterTest.php
new file mode 100644
index 0000000..fc296a7
--- /dev/null
+++ b/tests/CodeIgniterTest.php
@@ -0,0 +1,64 @@
+<?php
+
+require_once __DIR__ . '/../vendor/codeigniter4/framework/system/Test/bootstrap.php';
+
+use PHPUnit\Framework\TestCase;
+
+use CodeIgniter\Config\BaseConfig;
+use CodeIgniter\Config\BaseService;
+use CodeIgniter\Config\Factories;
+use CodeIgniter\DataCaster\Cast\BaseCast;
+use CodeIgniter\Database\Config;
+use CodeIgniter\Model;
+use CodeIgniter\Settings\Settings;
+use CodeIgniter\Test\DatabaseTestTrait;
+use Config\Database;
+use Pgvector\Vector;
+
+class CastVector extends BaseCast
+{
+    public static function get(mixed $value, array $params = [], ?object $helper = null): Vector
+    {
+        return new Vector($value);
+    }
+}
+
+class ItemModel extends Model
+{
+    protected $table = 'ci_items';
+    protected $allowedFields = ['embedding'];
+
+    protected array $casts = [
+        'embedding' => 'vector',
+    ];
+
+    protected array $castHandlers = [
+        'vector' => CastVector::class,
+    ];
+}
+
+final class CodeIgniterTest extends TestCase
+{
+    public function testWorks()
+    {
+        $config = [
+            'DSN' => 'Postgre://localhost/pgvector_php_test?charset=utf8',
+        ];
+        $db = Database::connect($config);
+
+        $db->query('CREATE EXTENSION IF NOT EXISTS vector');
+        $db->query('DROP TABLE IF EXISTS ci_items');
+        $db->query('CREATE TABLE IF NOT EXISTS ci_items (id bigserial PRIMARY KEY, embedding vector(3))');
+
+        $itemModel = new ItemModel($db);
+        $itemModel->insert(['embedding' => new Vector([1, 1, 1])], false);
+        $itemModel->insert(['embedding' => new Vector([2, 2, 2])], false);
+        $itemModel->insert(['embedding' => new Vector([1, 1, 2])], false);
+
+        $escaped = $db->escape(new Vector([1, 1, 1]));
+        $items = $itemModel->orderBy("embedding <-> $escaped")->findAll();
+        $this->assertEquals([1, 3, 2], array_map(fn ($v) => $v['id'], $items));
+        $this->assertEquals(new Vector([1, 1, 2]), $items[1]['embedding']);
+        $this->assertInstanceOf(Vector::class, $items[1]['embedding']);
+    }
+}