diff --git a/composer.json b/composer.json
index b37a3fb..5f6f539 100644
--- a/composer.json
+++ b/composer.json
@@ -4,6 +4,7 @@
     "type": "library",
     "require": {
         "php": "^8.5",
+        "psr/http-factory": "^1.1",
         "psr/http-message": "^2.0",
         "potter/closeable": "^0.0.1",
         "potter/detachable": "^0.0.1",
diff --git a/src/Potter/Stream/StreamFactoryInterface.php b/src/Potter/Stream/StreamFactoryInterface.php
index 56bce07..d0f4480 100644
--- a/src/Potter/Stream/StreamFactoryInterface.php
+++ b/src/Potter/Stream/StreamFactoryInterface.php
@@ -5,6 +5,11 @@ declare(strict_types=1);
 namespace Potter\Stream;
 
 use \Psr\Http\Message\StreamFactoryInterface as BaseStreamFactoryInterface;
+use \Psr\Http\Message\StreamInterface as BaseStreamInterface;
 
 interface StreamFactoryInterface extends BaseStreamFactoryInterface
-{ }
+{
+    public function createStream(string $content = ''): BaseStreamInterface;
+    public function createStreamFromFile(string $filename, string $mode = 'r'): BaseStreamInterface;
+    public function createStreamFromResource($resource): BaseStreamInterface;
+}