diff --git a/IMPLEMENTATION.md b/IMPLEMENTATION.md
index 5d1d962..5407c50 100644
--- a/IMPLEMENTATION.md
+++ b/IMPLEMENTATION.md
@@ -353,7 +353,9 @@ Effect: Sets every register (excluding IP and RP) to GG (0x4747)
 ```
 Full name: DEBuG
 Usage: DEBG
-Effect: Prints the status of every register and the flags
+Effect: Prints the status of every register and the flags. 
+
+NOTE: The DBG preprocessor flag has to be enabled!
 ```
 
 [Instruction]: ./res/instruction.png