Index: trunk/resources/data/validator/deprecated.mapcss
===================================================================
--- trunk/resources/data/validator/deprecated.mapcss	(revision 18230)
+++ trunk/resources/data/validator/deprecated.mapcss	(revision 18405)
@@ -2327,4 +2327,12 @@
 }
 
+/* #21954 decoturf was added to JOSM presets in r8123 and replaced with acrylic in r18404 */
+*[surface=decoturf] {
+  throwWarning: tr("{0} is deprecated", "{0.tag}");
+  suggestAlternative: "surface=acrylic";
+  fixAdd: "surface=acrylic";
+  group: tr("deprecated tagging");
+}
+
 /* #20637 */
 *[role] {