diff --git a/src/main/java/org/apache/commons/collections4/functors/NullPredicate.java b/src/main/java/org/apache/commons/collections4/functors/NullPredicate.java
index ff1b934e0..8aca8c870 100644
--- a/src/main/java/org/apache/commons/collections4/functors/NullPredicate.java
+++ b/src/main/java/org/apache/commons/collections4/functors/NullPredicate.java
@@ -23,6 +23,7 @@ import org.apache.commons.collections4.Predicate;
 /**
  * Predicate implementation that returns true if the input is null.
  *
+ * @param <T> the type of the input to the predicate.
  * @since 3.0
  */
 public final class NullPredicate<T> implements Predicate<T>, Serializable {