diff --git a/memory.x b/memory.x
index fca9aad..1afa651 100644
--- a/memory.x
+++ b/memory.x
@@ -2,6 +2,7 @@
 
 MEMORY
 {
+  /* The last flash sector is reserved for config */
   FLASH (rx)      : ORIGIN = 0x8000000, LENGTH = 896K
   RAM (xrw)       : ORIGIN = 0x20000000, LENGTH = 112K - 4
   /* reserved for DFU trigger message */