Index: trunk/data/validator/deprecated.mapcss
===================================================================
--- trunk/data/validator/deprecated.mapcss	(revision 10798)
+++ trunk/data/validator/deprecated.mapcss	(revision 10860)
@@ -279,6 +279,5 @@
 }
 
-/* see #10107, #10108, #10929 - http://wiki.openstreetmap.org/wiki/Proposed_features/leaftype#Features.2FPages_affected */
-*[wood=deciduous],
+/* see #10107, #10108, #10929, #13391 - http://wiki.openstreetmap.org/wiki/Proposed_features/leaftype#Features.2FPages_affected */
 *[type=broad_leaved],
 *[type=broad_leafed] {
@@ -319,4 +318,9 @@
   fixRemove: "type";
   fixAdd: "leaf_cycle=deciduous";
+}
+
+*[wood=deciduous] {
+  throwWarning: tr("{0} is deprecated", "{0.tag}");
+  suggestAlternative: "leaf_type + leaf_cycle";
 }