diff --git a/API-changes-between-v2.0-and-v2.1.md b/API-changes-between-v2.0-and-v2.1.md
index 4b03044..877f6d3 100644
--- a/API-changes-between-v2.0-and-v2.1.md
+++ b/API-changes-between-v2.0-and-v2.1.md
@@ -6,6 +6,7 @@
  * `MarkersSymbolizer` 
   * `marker-type` is removed, built in ellipse and arrow types now can be referenced like `file="shape://ellipse"` and `file="shape://arrow"` - although this interface is unstable and may continue to change.
  * `ShieldSymbolizer` attribute `no_text` - Simply leave the text empty if you don't want any text to be rendered.
+ * `XML DTD` in `utils/xml` since it was unmaintained: https://github.com/mapnik/mapnik/issues/1402
 
 ## Changed