diff --git a/data/message_template.msg b/data/message_template.msg
index 6702de9..1ec83cb 100644
--- a/data/message_template.msg
+++ b/data/message_template.msg
@@ -8707,6 +8707,11 @@ version 2.0
 		{	Agents		U8				}
 		{	MapImageID	LLUUID			}
 	}
+	{	
+		Size			Variable
+		{	SizeX		U16				}
+		{	SizeY		U16				}
+	}
 }
 
 // viewer -> sim