diff --git a/aes/rtl/vhdl/aes_pkg.vhd b/aes/rtl/vhdl/aes_pkg.vhd
index 7afeadc..ed4baa6 100644
--- a/aes/rtl/vhdl/aes_pkg.vhd
+++ b/aes/rtl/vhdl/aes_pkg.vhd
@@ -85,6 +85,8 @@ package aes_pkg is
 
   function gmul (a : std_logic_vector(7 downto 0); b : std_logic_vector(7 downto 0)) return std_logic_vector;
 
+  function addroundkey (data : in std_logic_vector(127 downto 0), key )
+
 
 end package aes_pkg;