diff --git a/pcb/rev.A/ERRATA.txt b/pcb/rev.A/ERRATA.txt
new file mode 100644
index 0000000..7d1554d
--- /dev/null
+++ b/pcb/rev.A/ERRATA.txt
@@ -0,0 +1 @@
+- Incorrect Y1/Y2 generator circuit - see rev.A1 for fix