diff --git a/notes/2.13.md b/notes/2.13.md
index 9af7553152..08d876960d 100644
--- a/notes/2.13.md
+++ b/notes/2.13.md
@@ -37,6 +37,10 @@ Corresponding issues/pull requests:
 
 # Behavior Changes from Past Releases
 
+## Format.GPX: No more prefixes
+
+No `gpx:` prefix is added in the XML tags anymore when writing GPX from `OpenLayers` features. It seems like it is not supported by most of the tools that are able to read GPX.
+
 ## Layer.Grid: Tile queue and tileLoadingDelay changes
 
 With the introduction of OpenLayers.TileManager, tile queueing has become optional. The default behavior is back to how it was in OpenLayers 2.11. To use a tile queue in 2.13, the map needs to be configured with a tileManager, e.g.: