diff --git a/doc/diode-marking.jpeg b/doc/diode-marking.jpeg
new file mode 100644
index 0000000..433b0b2
Binary files /dev/null and b/doc/diode-marking.jpeg differ
diff --git a/doc/overview-diode-resistors.jpeg b/doc/overview-diode-resistors.jpeg
new file mode 100644
index 0000000..0d7aaed
Binary files /dev/null and b/doc/overview-diode-resistors.jpeg differ
diff --git a/doc/usb-polarity.jpeg b/doc/usb-polarity.jpeg
new file mode 100644
index 0000000..ce14f4d
Binary files /dev/null and b/doc/usb-polarity.jpeg differ