diff --git a/Executables.md b/Executables.md
index 7f7c94e..ac05705 100644
--- a/Executables.md
+++ b/Executables.md
@@ -9,7 +9,7 @@ Sentinel 65X's firmware is designed to load and execute binaries in the `PGZ` fo
 
 ## PGZ Format
 
-The first byte of a PGZ file is always an ASCII "Z".
+The first byte of a PGZ file is always an ASCII "Z", hexadecimal value `0x5A`, decimal value `90`.
 
 This is followed by one or more segments, packed with no padding or separator. Each such segment has the following format: