diff --git a/src/Resources/config/encoders.yml b/src/Resources/config/encoders.yml
index 3d636c2..5d13566 100644
--- a/src/Resources/config/encoders.yml
+++ b/src/Resources/config/encoders.yml
@@ -1,3 +1,7 @@
+# Leaflet encoders.
+#
+# The encoders transforms the definitions into javascript. The encoders has to be an implementation of the
+# EventSubscriberInterface of the event dispatcher.
 services:
   netzmacht.contao_leaflet_maps.encoder.map:
     class: Netzmacht\LeafletPHP\Encoder\MapEncoder