diff --git a/include/message.h b/include/message.h
index 621cd02..c9918c4 100644
--- a/include/message.h
+++ b/include/message.h
@@ -5,6 +5,8 @@
 
 #define PACKED __attribute__((__packed__))
 
+const uint8_t PREAMBLE = 0x55;
+
 struct PACKED Header {
 
     // The preamble marks the start of a message and is always 0x55