diff --git a/parquet-column/src/main/java/org/apache/parquet/filter2/predicate/UserDefinedPredicate.java b/parquet-column/src/main/java/org/apache/parquet/filter2/predicate/UserDefinedPredicate.java
index 05365b9918..e5103b4ae7 100644
--- a/parquet-column/src/main/java/org/apache/parquet/filter2/predicate/UserDefinedPredicate.java
+++ b/parquet-column/src/main/java/org/apache/parquet/filter2/predicate/UserDefinedPredicate.java
@@ -40,8 +40,11 @@ public UserDefinedPredicate() { }
 
   /**
    * Return true to keep the record with this value, false to drop it.
+   * <p>
+   * This method shall handle {@code null} values returning whether this user defined predicate accepts {@code null}
+   * values or not.
    *
-   * @param value a value
+   * @param value a value (might be {@code null})
    * @return true to keep the record with the value, false to drop it
    */
   public abstract boolean keep(T value);