diff --git a/Makefile b/Makefile
index 2f9f053..ca527e4 100644
--- a/Makefile
+++ b/Makefile
@@ -13,7 +13,7 @@ SYSCLK ?= 11056
 FOSC ?=11056000L
 CFLAGS ?= -DWITH_ALT_LED9 -DWITHOUT_LEDTABLE_RELOC -DSHOW_TEMP_DATE_WEEKDAY
 
-LIBSRC = uart_init.c
+LIBSRC = uart_init.c uart_send_chr.c uart_send_str.c
 
 LIBOBJ =$(patsubst %.c,%.rel, $(LIBSRC))
 LIBNAME=mc8051fun.lib
diff --git a/mc8051fun.h b/mc8051fun.h
index e484ff0..223995b 100644
--- a/mc8051fun.h
+++ b/mc8051fun.h
@@ -3,4 +3,9 @@
 
 #include <8052.h>
 
+
+void uart_init(long fosc, long baud);
+void uart_send_chr(char tx_data);
+void uart_send_str(const char *str);
+
 #endif