diff --git a/terranmon.txt b/terranmon.txt
index 7bfa81b..d89145d 100644
--- a/terranmon.txt
+++ b/terranmon.txt
@@ -322,7 +322,7 @@ MMIO
     Busy flags
     1: Codec in-use
     2: Draw Instructions being decoded
-19 RO
+19 WO
     Write non-zero value to initiate the Draw Instruction decoding
 20..21 RO
     Program Counter for the Draw Instruction decoding