diff --git a/legacy/startup.S b/legacy/startup.S
index f79646cad7..15cbf837ba 100644
--- a/legacy/startup.S
+++ b/legacy/startup.S
@@ -21,7 +21,7 @@ memset_reg:
 reset_handler:
 
 #if MEMORY_PROTECT
-// we need to perform this in case an old bootloader
+// we need to perform this in case an old bootloader (<1.8.0)
 // is starting the new firmware, these will be set incorrectly
   ldr r0, =0xE000ED08  // r0 = VTOR address
   ldr r1, =0x08010400  // r1 = FLASH_APP_START