diff --git a/src/Potter/Writeable/WriteableInterface.php b/src/Potter/Writeable/WriteableInterface.php
index 8b2ecf3..403ed80 100644
--- a/src/Potter/Writeable/WriteableInterface.php
+++ b/src/Potter/Writeable/WriteableInterface.php
@@ -6,6 +6,6 @@ namespace Potter\Writeable;
 
 interface WriteableInterface
 {
-    public function isReadable(): bool;
-    public function read(int $length): string;
+    public function isWritable(): bool;
+    public function write(string $string): int;
 }