diff --git a/include/m_post_office.h b/include/m_post_office.h
index 91be0cda..2ba0eb85 100644
--- a/include/m_post_office.h
+++ b/include/m_post_office.h
@@ -42,8 +42,14 @@ typedef struct post_office_s {
   /* 0x834 */ lbRTC_time_c delivery_time; /* time when Pete should 'deliver' the mail */
 } PostOffice_c;
 
+extern int mPO_count_mail(int house_no);
 extern int mPO_get_keep_mail_sum();
-extern int mPO_receipt_proc(Mail_c* mail, int type);
+extern int mPO_receipt_proc(Mail_c* mail, int send_type);
+extern int mPO_delivery_one_address(int house_no);
+extern void mPO_delivery_all_address_proc();
+extern void mPO_business_proc(GAME_PLAY* play);
+extern void mPO_first_work();
+extern void mPO_post_office_init();
 
 #ifdef __cplusplus
 }