diff --git a/doc/tutorial/basics/bytes.md b/doc/tutorial/basics/bytes.md
index 77341a2..ce11d7f 100644
--- a/doc/tutorial/basics/bytes.md
+++ b/doc/tutorial/basics/bytes.md
@@ -11,7 +11,7 @@
 
     \xnn    // arbitrary byte value defined as a 2-digit hexadecimal number
     \0nnn   // arbitrary byte value defined as a 3-digit octal number
-
+<!-- jba: this contradicts the spec, which has \nnn (no leading zero) -->
 
 <!-- CUE editor -->
 ```