diff --git a/Appendix-C:-Firmware-programming.md b/Appendix-C:-Firmware-programming.md
index b17c3c1..bb8ca3a 100644
--- a/Appendix-C:-Firmware-programming.md
+++ b/Appendix-C:-Firmware-programming.md
@@ -41,7 +41,7 @@ If your board doesn't have a header soldered to it (i.e. there are holes that go
 ## Step 3: Add the Ploopy Trackball board definition to the Arduino IDE
 In this step, you'll add the Ploopy Trackball board definition to your install of the Arduino IDE.
 
-1. Visit the [Ploopy Trackball Github firmware page](https://github.com/ploopyco/mouse/tree/master/firmware) and download the entire `hardware/ploopy/avr` directory onto your computer.
+1. Visit the [Ploopy Trackball Github firmware page](https://github.com/ploopyco/trackball/tree/master/firmware) and download the entire `hardware/ploopy/avr` directory onto your computer.
 2. Copy the `hardware/ploopy/avr` directory tree into your Arduino folder.
    - On Windows machines, this could be somewhere like `C:\Program Files\Arduino` or `C:\Program Files (x86)\Arduino`.
    - If you're part of the Linux master race, look somewhere like `~/Arduino`.
@@ -68,7 +68,7 @@ If the Arduino IDE reports that you successfully flashed the firmware onto the A
 ## Step 5: Program the Ploopy Trackball
 In this step, you'll use the Arduino Nano to program the Ploopy Trackball.
 
-1. Visit the [Ploopy Trackball Github firmware page](https://github.com/ploopyco/mouse/tree/master/firmware) and download the entire `production` directory onto your computer.
+1. Visit the [Ploopy Trackball Github firmware page](https://github.com/ploopyco/trackball/tree/master/firmware) and download the entire `production` directory onto your computer.
    - *NOTE THAT* not all of the firmware versions will work on all of the boards!
    - First, check to see what kind of main board you have. Look at the board for a revision number (the board containing the sensor, the one that lies flat, not the vertical one). The code should look something like "R1.00X", where X is some number.
    - If that number is R1.004, R1.003 or, very rarely, R1.002, use the firmware in the ["r1.004" branch of the code](https://github.com/ploopyco/trackball/tree/r1.004).