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diff --git a/notes.md b/notes.md
index 5ecb152..362445f 100644
--- a/notes.md
+++ b/notes.md
@@ -149,3 +149,7 @@ IDK about HDMI compression yet, but naively uncompressed we're looking
 at wanting to shove ~60 MB/s (480 Mb/s).
 
 Compression is an optional feature introduced in HDMI 2.1 :(
+
+----
+
+PIO-based USB needs the system clock to be a multiple of 120mhz