diff --git a/src/main/java/org/springframework/data/querydsl/ReactiveQuerydslPredicateExecutor.java b/src/main/java/org/springframework/data/querydsl/ReactiveQuerydslPredicateExecutor.java
index 697b35043..956c5fca4 100644
--- a/src/main/java/org/springframework/data/querydsl/ReactiveQuerydslPredicateExecutor.java
+++ b/src/main/java/org/springframework/data/querydsl/ReactiveQuerydslPredicateExecutor.java
@@ -24,66 +24,97 @@ import com.querydsl.core.types.OrderSpecifier;
 import com.querydsl.core.types.Predicate;
 
 /**
- * Interface to issue queries using Querydsl {@link Predicate} instances.
+ * Interface to issue queries using Querydsl {@link Predicate} instances. <br />
+ * Intended for usage along with the {@link org.springframework.data.repository.reactive.ReactiveCrudRepository}
+ * interface to wire in <a href="http://http://www.querydsl.com">Querydsl</a>support.
+ *
+ * <pre>
+ *     <code>
+ *
+ *  public interface PersonRepository extends ReactiveCrudRepository&lt;Person, String&gt;, ReactiveQuerydslPredicateExecutor&lt;Person&gt; {
+ *             
+ *  }
+ *
+ *  // ...
+ *
+ *  personRepository.findOne(QPerson.person.email.eq("t-800&#0064;skynet.io"))
+ *      .flatMap(t800 ->
+ *      //....
+ *
+ *     </code>
+ * </pre>
+ *
+ * <strong>IMPORTANT:</strong> Please check the module specific documentation whether or not Querydsl is supported.
  *
  * @author Mark Paluch
+ * @author Christoph Strobl
  * @since 2.2
  */
 public interface ReactiveQuerydslPredicateExecutor<T> {
 
 	/**
-	 * Returns a single entity matching the given {@link Predicate} or {@link Mono#empty()} if none was found.
+	 * Returns a {@link Mono} emitting the entity matching the given {@link Predicate} or {@link Mono#empty()} if none was
+	 * found.
 	 *
 	 * @param predicate must not be {@literal null}.
-	 * @return a single entity matching the given {@link Predicate} or {@link Mono#empty()} if none was found.
+	 * @return a {@link Mono} emitting a single entity matching the given {@link Predicate} or {@link Mono#empty()} if
+	 *         none was found.
+	 * @throws IllegalArgumentException if the required parameter is {@literal null}.
 	 * @throws org.springframework.dao.IncorrectResultSizeDataAccessException if the predicate yields more than one
 	 *           result.
 	 */
 	Mono<T> findOne(Predicate predicate);
 
 	/**
-	 * Returns all entities matching the given {@link Predicate}. In case no match could be found, {@link Flux} emits no
-	 * items.
+	 * Returns a {@link Flux} emitting all entities matching the given {@link Predicate}. In case no match could be found,
+	 * {@link Flux} emits no items.
 	 *
 	 * @param predicate must not be {@literal null}.
-	 * @return all entities matching the given {@link Predicate}.
+	 * @return a {@link Flux} emitting all entities matching the given {@link Predicate} one by one.
+	 * @throws IllegalArgumentException if the required parameter is {@literal null}.
 	 */
 	Flux<T> findAll(Predicate predicate);
 
 	/**
-	 * Returns all entities matching the given {@link Predicate} applying the given {@link Sort}. In case no match could
-	 * be found, {@link Flux} emits no items.
+	 * Returns a {@link Flux} emitting all entities matching the given {@link Predicate} applying the given {@link Sort}.
+	 * In case no match could be found, {@link Flux} emits no items.
 	 *
 	 * @param predicate must not be {@literal null}.
-	 * @param sort the {@link Sort} specification to sort the results by, may be {@link Sort#empty()}, must not be
+	 * @param sort the {@link Sort} specification to sort the results by, may be {@link Sort#unsorted()}, must not be
 	 *          {@literal null}.
-	 * @return all entities matching the given {@link Predicate}.
+	 * @return a {@link Flux} emitting all entities matching the given {@link Predicate} one by one.
+	 * @throws IllegalArgumentException if one of the required parameters is {@literal null}.
 	 */
 	Flux<T> findAll(Predicate predicate, Sort sort);
 
 	/**
-	 * Returns all entities matching the given {@link Predicate} applying the given {@link OrderSpecifier}s. In case no
-	 * match could be found, {@link Flux} emits no items.
+	 * Returns a {@link Flux} emitting all entities matching the given {@link Predicate} applying the given
+	 * {@link OrderSpecifier}s. In case no match could be found, {@link Flux} emits no items.
 	 *
 	 * @param predicate must not be {@literal null}.
 	 * @param orders the {@link OrderSpecifier}s to sort the results by.
-	 * @return all entities matching the given {@link Predicate} applying the given {@link OrderSpecifier}s.
+	 * @return a {@link Flux} emitting all entities matching the given {@link Predicate} applying the given
+	 *         {@link OrderSpecifier}s.
+	 * @throws IllegalArgumentException if one of the required parameter is {@literal null}, or contains a {@literal null}
+	 *           value.
 	 */
 	Flux<T> findAll(Predicate predicate, OrderSpecifier<?>... orders);
 
 	/**
-	 * Returns all entities ordered by the given {@link OrderSpecifier}s.
+	 * Returns a {@link Flux} emitting all entities ordered by the given {@link OrderSpecifier}s.
 	 *
 	 * @param orders the {@link OrderSpecifier}s to sort the results by.
-	 * @return all entities ordered by the given {@link OrderSpecifier}s.
+	 * @return a {@link Flux} emitting all entities ordered by the given {@link OrderSpecifier}s.
+	 * @throws IllegalArgumentException one of the {@link OrderSpecifier OrderSpecifiers} is {@literal null}.
 	 */
 	Flux<T> findAll(OrderSpecifier<?>... orders);
 
 	/**
-	 * Returns the number of instances matching the given {@link Predicate}.
+	 * Returns a {@link Mono} emitting the number of instances matching the given {@link Predicate}.
 	 *
 	 * @param predicate the {@link Predicate} to count instances for, must not be {@literal null}.
-	 * @return the number of instances matching the {@link Predicate}.
+	 * @return a {@link Mono} emitting the number of instances matching the {@link Predicate} or {@code 0} if none found.
+	 * @throws IllegalArgumentException if the required parameter is {@literal null}.
 	 */
 	Mono<Long> count(Predicate predicate);
 
@@ -91,7 +122,9 @@ public interface ReactiveQuerydslPredicateExecutor<T> {
 	 * Checks whether the data store contains elements that match the given {@link Predicate}.
 	 *
 	 * @param predicate the {@link Predicate} to use for the existence check, must not be {@literal null}.
-	 * @return {@literal true} if the data store contains elements that match the given {@link Predicate}.
+	 * @return a {@link Mono} emitting {@literal true} if the data store contains elements that match the given
+	 *         {@link Predicate}, {@literal false} otherwise.
+	 * @throws IllegalArgumentException if the required parameter is {@literal null}.
 	 */
 	Mono<Boolean> exists(Predicate predicate);
 }