diff --git a/PixelHub Protocol.md b/PixelHub Protocol.md
index 225b487..5931c75 100644
--- a/PixelHub Protocol.md	
+++ b/PixelHub Protocol.md	
@@ -11,6 +11,7 @@ In this specification document, when referring to bytes, The C++ notation will b
 
 Each PixelHub message is terminated by a null byte (`0b00000000`).
 
+The current `Protocol Version` is `1`.
 
 ## Conversation Flow