diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..e524d79
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+.vscode/
+build/
diff --git a/README.md b/README.md
index cc03025..740bc1d 100644
--- a/README.md
+++ b/README.md
@@ -1,11 +1,19 @@
 # Arduino C
 
-Programming the Arduino in pure C.
+Programming the Arduino in pure C on Linux.
+
+## Requirements
+
+* arvdude
+* arv-gcc
+* avr-libc
 
 ## Compile and upload
 
 Run using the following command (example port):
 
 ```
-sudo ./compile /dev/ttyUSB0
+sudo ./compile.sh /dev/ttyUSB0
 ```
+
+The port can be found by looking inside `/dev`, the system file `ll /sys/class/tty/ttyUSB*`, or by running `lsusb`.
diff --git a/compile b/compile.sh
similarity index 91%
rename from compile
rename to compile.sh
index 02ae63d..d8ba68f 100755
--- a/compile
+++ b/compile.sh
@@ -14,17 +14,19 @@ echo "BAUD set to $BAUD"
 rm -rf build || true
 mkdir build
 
+# compile files
 avr-gcc -Os -DF_CPU=16000000UL -mmcu=$MMCU -c -o build/servo.o -Wall servo/servo.c
-
 avr-gcc -Os -DF_CPU=16000000UL -mmcu=$MMCU -c -o build/rf24.o -Wall rf24/rf24.c
-
 avr-gcc -Os -DF_CPU=16000000UL -mmcu=$MMCU -c -o build/util.o -Wall ard/util.c
 avr-gcc -Os -DF_CPU=16000000UL -mmcu=$MMCU -c -o build/serial.o -Wall ard/serial.c
 avr-gcc -Os -DF_CPU=16000000UL -mmcu=$MMCU -c -o build/pins.o -Wall ard/pins.c
 avr-gcc -Os -DF_CPU=16000000UL -mmcu=$MMCU -c -o build/main.o -Wall main.c
 
+# compile binary
 avr-gcc -mmcu=$MMCU build/*.o -o build/main
-avr-objcopy -O ihex -R .eeprom build/main build/main.hex
-avrdude -F -V -c arduino -p $AVR_TYPE -P $1 -b $BAUD -U flash:w:build/main.hex
 
-rm -r build
+# create file to upload to arduino
+avr-objcopy -O ihex -R .eeprom build/main build/main.hex
+
+# upload to arduino
+avrdude -F -V -c arduino -p $AVR_TYPE -P $1 -b $BAUD -U flash:w:build/main.hex