diff --git a/src/makefile b/src/makefile
index e027f20..8c9a2c8 100644
--- a/src/makefile
+++ b/src/makefile
@@ -90,7 +90,7 @@ GENDEPFLAGS += -MMD -MP -MF $@.dep  # generate dependency files
 CC      := avr-gcc
 OBJCOPY := avr-objcopy
 SIZE    := avr-size
-
+CHKSUM  := md5sum
 
 # remove whitespace from some of the options
 FORMAT := $(strip $(FORMAT))
@@ -110,6 +110,8 @@ all: $(TARGET).hex $(TARGET).eep
 	@echo
 	$(SIZE) --target=$(FORMAT) $(TARGET).eep
 	@echo
+	$(CHKSUM) $(TARGET).hex $(TARGET).eep
+	@echo
 	@echo 'you can load "$(TARGET).hex" and "$(TARGET).eep" onto the'
 	@echo 'Teensy using the Teensy loader'
 	@echo