diff --git a/.gitignore b/.gitignore
index a8a0dce..29a82f6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 *.bin
+*.elf
\ No newline at end of file
diff --git a/Makefile b/Makefile
index ffaa8fc..ba34c52 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,7 @@
 SHELL=/bin/bash
 
 BIN = $(wildcard ./*.bin)
+ELF = $(wildcard ./*.elf)
 OFFSET = 0x08000000
 OPEN_OCD_PROGRAMMER_CFG = /usr/local/share/openocd/scripts/interface/stlink.cfg
 OPEN_OCD_MK_CFG = /usr/local/share/openocd/scripts/target/stm32g0x.cfg
diff --git a/README.md b/README.md
index c5539b4..8694272 100644
--- a/README.md
+++ b/README.md
@@ -11,3 +11,8 @@ Target:
 	make flash-st  : upload flash use st-flash
 	make erase-st  : erase flash use st-flash
 	make gdb       : open GNU debugger
+
+Example use:
+
+	make flash BIN=./dodopiza.bin OPEN_OCD_MK_CFG=./stm32f10x.cfg
+	
diff --git a/flash_uploader.mk b/flash_uploader.mk
index 8f31474..8c7de80 100644
--- a/flash_uploader.mk
+++ b/flash_uploader.mk
@@ -6,6 +6,7 @@ SHELL=/bin/bash
 # 	OFFSET = 0x08000000
 # 	OPEN_OCD_PROGRAMMER_CFG = /usr/local/share/openocd/scripts/interface/stlink.cfg
 # 	OPEN_OCD_MK_CFG = /usr/local/share/openocd/scripts/target/stm32g0x.cfg
+#   ELF = ./Project.elf # to use GDB
 
 HELP_FLASH_UPLOADER = \
 	" make flash     : upload flash use OpenOCD\n"\
@@ -17,7 +18,7 @@ HELP_FLASH_UPLOADER = \
 
 .PHONY:  flash erase flash-st erase-st gdb-server gdb
 
-flash:
+flash: $(BIN)
 	openocd -f $(OPEN_OCD_PROGRAMMER_CFG) \
 	-f $(OPEN_OCD_MK_CFG) \
 	-c init \
@@ -30,17 +31,17 @@ erase:
 	-c "flash init; init; reset halt; flash erase_sector 0 1 last " \
 	-c shutdown \
 
-flash-st:
+flash-st: $(BIN)
 	st-flash write $(BIN) $(OFFSET)
 
 erase-st:
 	st-flash erase
 
 OPENOCD_PORT=3333
-gdb: $(PROJECT)
+gdb: $(ELF)
 	openocd -f $(OPEN_OCD_PROGRAMMER_CFG) \
 	-f $(OPEN_OCD_MK_CFG) \
 	-c 'transport select hla_swd; reset_config none' &
-	arm-none-eabi-gdb $(PROJECT) \
+	arm-none-eabi-gdb $(ELF) \
 	-ex 'target remote localhost:$(OPENOCD_PORT); monitor reset halt' \
 	&& killall openocd