diff --git a/Chroma-Aeon-74.md b/Chroma-Aeon-74.md
index a7b3ea5..1d0b370 100644
--- a/Chroma-Aeon-74.md
+++ b/Chroma-Aeon-74.md
@@ -68,3 +68,14 @@ An xds110 or other cJTAG programmer is needed to program the CC1311.
 Notes:
 1. i.e. "External Bias, Differential mode.
 
+## Tag Serial Number location
+
+The tag's serial number is stored in the CC1311's internal flash at offset 0x2000 !
+Which will complicate the installation of OEPL firmware!
+
+```
+SR01234567C:
+00002000  53 52 01 12 35 67 43 00  ff ff ff ff ff 20 03 e0  |SR..1sC...... ..|
+```
+
+