Explain UTFGrid

studentdsx · Oct 27, 2011 · f29c34b · f29c34b
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diff --git a/1.2/spec.md b/1.2/spec.md
@@ -1,9 +1,9 @@
-# MBTiles 1.1
+# MBTiles 1.2
 
 # Sub-sections:
 
 * **Interaction**: HTTP endpoints needed for implementing interactivity
-* **UTFGrid**: storage of data used for interactivity
+* **UTFGrid**: This specification relies on [UTFGrid 1.2](https://github.com/mapbox/utfgrid-spec) for interactivity.
 
 ## Abstract
 

diff --git a/README.md b/README.md
@@ -5,6 +5,15 @@ MBTiles is a specification for storing tiled map data in
 MBTiles files, known as **tilesets**, must implement the specification below
 to ensure compatibility with devices.
 
+## UTFGrid
+
+The MBTiles specification previously contained the
+[UTFGrid specification](https://github.com/mapbox/utfgrid-spec).
+It was removed in version 1.2 and moved into its own specification
+with synced version numbers - so MBTiles 1.2 is compatible with
+UTFGrid 1.2. The specs integrate but do not require each other
+for compliance.
+
 # Versions
 
 * **Development** - NOT USABLE: [1.2](https://github.com/mapbox/mbtiles-spec/blob/master/1.2/spec.md)