diff --git a/def-alu.v b/def-alu.v
index 17c5d0f..e27f1c0 100644
--- a/def-alu.v
+++ b/def-alu.v
@@ -41,15 +41,15 @@
 `define ALU_REG_D        3
 `define ALU_REG_D0       4
 `define ALU_REG_D1       5
-// 6
-// 7
+`define ALU_REG_PC       6
+`define ALU_REG_RSTK     7
 `define ALU_REG_R0       8
 `define ALU_REG_R1       9
 `define ALU_REG_R2      10
 `define ALU_REG_R3      11
 `define ALU_REG_R4      12
 `define ALU_REG_CST     13
-`define ALU_REG_M       14
-`define ALU_REG_0       15
+`define ALU_REG_ST      14
+`define ALU_REG_M       15
 
 `endif
\ No newline at end of file