diff --git a/docs/articles/map_format.txt b/docs/articles/map_format.txt
index 7583a5b7b..18c6f617a 100644
--- a/docs/articles/map_format.txt
+++ b/docs/articles/map_format.txt
@@ -2,7 +2,7 @@ Title: Map File Format
 
 Group: Structure
 (start code)
-int ID // should be "MAPP"
+int ID // should be "DATA"
 int version // should be 2
 int size
 int swaplen