diff --git a/src/CPPrivateKey.php b/src/CPPrivateKey.php
index 6c72977..30a97f8 100644
--- a/src/CPPrivateKey.php
+++ b/src/CPPrivateKey.php
@@ -15,4 +15,5 @@ class CPPrivateKey
 	
 	public function get_KeySpec(){}
 	
+	public function set_KeyPin(string $pin){}
 }