diff --git a/README.md b/README.md
index c070cb7..5729f7c 100644
--- a/README.md
+++ b/README.md
@@ -38,3 +38,4 @@ PCB rev 1:
 * R214 -> 4.7k
 * LM339PT is in TSSOP package. Change for SOIC P/N
 * GDT200 minimum firing voltage is too low
+* the relay model should be changed to 9001-05-00. 9001-05-02 is an undocumented normally closed variant.