+### 3. Program with Teensy Loader
+If you have PJRC Teensy see instruction of `Teensy Loader`.
+
+- <http://www.pjrc.com/teensy/loader.html>
+
+Or use this command if you have command line version of Teensy Loader installed.
+
+ $ make -f Makefile.<variant> teensy
+
+
+### 4. Program with Other programmer
+You may want to use other programmer like `avrdude` with AVRISPmkII, Aruduino or USBasp. In that case you can still use make target `program` for build with configuring `PROGRAM_CMD` in Makefile.
+
+ $ make -f Makefile.<variant> program
+
+