Update README.md

quad/Shield PCB/README.md

@@ -7,12 +7,15 @@ The PCB is meant to act as a custom shield for the Zybo boards mounted on the qu
 3.  Incorporate a voltage regulator to step the battery voltage down while also saving power and maintaining consistent output voltages.
 
 
-The layout and schematic of the board can be seen below. It has 4 different layers, each represented by a different color.
+The layout and schematic of the board can be seen below. It has 4 different layers, each represented by a different color. These images are screenshots taken in MultiSim and UltiBoard - the software we used to design the PCB.
 ![image](doc/images/PCB_r2_layout.PNG)
 ![image](doc/images/PCB_r2_schematic.PNG)
 
 
 
+# Future PCB Revisions
+Because it's possible that future teams may wish to change the hardware used on the quad, we have included the MultiBoard and UltiSim design files and the Bill of Materials used for creating and assembling the PCB.
+
 For more information on how to design and build PCBs, check out the useful tutorials below from EE 333 (taught by Dr. Tuttle). They walk you through the basics of using MultiSim and UltiBoard, as well as provide some information about PCB components and design.
  * [Tutorial 1 - Circuit Design, Schematic Creation with MultiSim, Component Footprints](doc/pcb_layout_tutorial_1.pdf)  
  * [Tutorial 2 - Transferring Board Schematic to Layout in UltiBoard, Arranging and Connecting Parts](doc/pcb_layout_tutorial_2.pdf)