diff --git a/Data-model-(in-progress).md b/Data-model-(in-progress).md
index eb3d20a..7a3a828 100644
--- a/Data-model-(in-progress).md
+++ b/Data-model-(in-progress).md
@@ -6,6 +6,9 @@ Relevant links:
 * [Refactor branch contract changes](https://github.com/Azgaar/Fantasy-Map-Generator/pull/842)
 
 Structure:
+
+`.map` file is a valid JSON capturing all data required to render and operate the map, including UI and style settings.
+
 ```json
 {
   "meta": {