Index: trunk/resources/data/validator/combinations.mapcss
===================================================================
--- trunk/resources/data/validator/combinations.mapcss	(revision 17457)
+++ trunk/resources/data/validator/combinations.mapcss	(revision 17480)
@@ -104,4 +104,5 @@
 *[parking                      ][amenity!~/^(parking|parking_space|parking_entrance|motorcycle_parking)$/][parking!=yes][parking!=no],
 way[cutline                    ][man_made!=cutline],
+*[zoo                          ][tourism!=zoo],
 *[bunker_type                  ][military!=bunker] {
   throwWarning: tr("{0} without {1}", "{0.key}", "{1.tag}");