diff --git a/Mage/src/mage/game/permanent/Battlefield.java b/Mage/src/mage/game/permanent/Battlefield.java
index e532f729533..3123a0c330c 100644
--- a/Mage/src/mage/game/permanent/Battlefield.java
+++ b/Mage/src/mage/game/permanent/Battlefield.java
@@ -71,6 +71,9 @@ public class Battlefield implements Serializable {
     /**
      * Returns a count of all {@link Permanent} that match the filter and are controlled by controllerId.
      * 
+     * Some filter predicates do not work here (e.g. AnotherPredicate() because filter.match() is called
+     * without controllerId. To use this predicates you can use count() instead of countAll()
+     * 
      * @param filter
      * @param controllerId
      * @param game