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diff --git a/PLAN.md b/PLAN.md
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--- a/PLAN.md
+++ b/PLAN.md
@@ -12,3 +12,5 @@
     1. [ ] PicoDVI hello-world
     2. [ ] "PiciDVI" to network
     3. [ ] reverse the flow of PicoDVI
+
+https://hackaday.com/2022/08/26/bit-banged-ethernet-on-the-raspberry-pi-pico/