diff --git a/README.md b/README.md
index 94489d9..a9f6dcf 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,7 @@ You need a few things:
   - Note that you _must_ have two receive ports which means revision C or later of the basic Pluto
 - Directional couplers (1 per port up to 4 ports)
   - I have been using [AAMCS-UDC-0.5G-18G-10dB-Sf](http://www.aa-mcs.com/wp-content/uploads/documents/AAMCS-UDC-0.5G-18G-10dB-Sf.pdf)
-- Charon switch board  - coming soon.
+- [Cerberus RF switch](https://git.brendanhaines.com/brendanhaines/cerberus_sp4t) + [Pluto IO Shield](https://git.brendanhaines.com/brendanhaines/pluto_io_shield)
   - Optional. Without this you'll be limited to S11 and uncalibrated S21 measurements (with required re-cabling)
   - There's nothing special about this particular board, if you want more than 4 ports you can make your own pretty easily. You just need 3 SPxT switches. Note that these switches will see tons of cycles so avoid mechanical switches
 - SMA cables