diff --git a/left/Makefile b/left/Makefile
index 2e4b524..87cabf4 100644
--- a/left/Makefile
+++ b/left/Makefile
@@ -30,6 +30,9 @@ STACK_SIZE = 0x0050
 CPU = -mcpu=cortex-m0plus
 FPU = -mfloat-abi=soft
 
+# Command for flashing the left half of the keyboard.
+FLASH_CMD = node ../lib/agent/packages/usb/update-module-firmware.js leftHalf $(PROJECT_OBJ:.axf=.bin)
+
 # Source files.
 SOURCE = $(wildcard src/*.c) \
          ../lib/KSDK_2.0_MKL03Z8xxx4/devices/MKL03Z4/system_MKL03Z4.c \
diff --git a/right/Makefile b/right/Makefile
index f6ef801..e0107cf 100644
--- a/right/Makefile
+++ b/right/Makefile
@@ -36,6 +36,9 @@ BUILD_FLAGS = -DCPU_$(PART)_cm4 -DBL_APP_VECTOR_TABLE_ADDRESS=$(BL_APP_VECTOR_TA
 CPU = -mcpu=cortex-m4
 FPU = -mfpu=fpv4-sp-d16 -mfloat-abi=hard
 
+# Command for flashing the right half of the keyboard.
+FLASH_CMD = node ../lib/agent/packages/usb/update-device-firmware.js $(PROJECT_OBJ:.axf=.hex)
+
 # Source files.
 SOURCE = $(wildcard src/*.c) \
          $(wildcard src/*/*.c) \
diff --git a/scripts/Makedefs.mk b/scripts/Makedefs.mk
index 98fc69f..f01f6fc 100644
--- a/scripts/Makedefs.mk
+++ b/scripts/Makedefs.mk
@@ -150,7 +150,7 @@ ifeq ($(INTERACTIVE),1)
     color_purple = \033[38;5;097m
 endif
 
-.PHONY: all clean
+.PHONY: all clean flash
 
 # The default rule, which causes the project to be built.
 all: $(PROJECT_OBJ)
@@ -160,6 +160,9 @@ clean:
 	@rm -rf $(BUILD_DIR) $(wildcard *~)
 	@echo "$(color_red)Done cleaning!$(color_default)"
 
+flash: all
+	@$(FLASH_CMD) || exit 1
+
 # Rebuild all objects when the Makefile changes.
 $(OBJS): Makefile