diff --git a/src/main/java/org/apache/commons/collections4/collection/PredicatedCollection.java b/src/main/java/org/apache/commons/collections4/collection/PredicatedCollection.java
index 87238c08d..71d80e8b3 100644
--- a/src/main/java/org/apache/commons/collections4/collection/PredicatedCollection.java
+++ b/src/main/java/org/apache/commons/collections4/collection/PredicatedCollection.java
@@ -57,6 +57,7 @@ public class PredicatedCollection<E> extends AbstractCollectionDecorator<E> {
      * @return a new predicated collection
      * @throws IllegalArgumentException if collection or predicate is null
      * @throws IllegalArgumentException if the collection contains invalid elements
+     * @since 4.0
      */
     public static <T> PredicatedCollection<T> predicatedCollection(final Collection<T> coll,
                                                                    final Predicate<? super T> predicate) {
diff --git a/src/main/java/org/apache/commons/collections4/collection/SynchronizedCollection.java b/src/main/java/org/apache/commons/collections4/collection/SynchronizedCollection.java
index 335515cc4..d7911842b 100644
--- a/src/main/java/org/apache/commons/collections4/collection/SynchronizedCollection.java
+++ b/src/main/java/org/apache/commons/collections4/collection/SynchronizedCollection.java
@@ -55,6 +55,7 @@ public class SynchronizedCollection<E> implements Collection<E>, Serializable {
      * @param coll  the collection to decorate, must not be null
      * @return a new synchronized collection
      * @throws IllegalArgumentException if collection is null
+     * @since 4.0
      */
     public static <T> SynchronizedCollection<T> synchronizedCollection(final Collection<T> coll) {
         return new SynchronizedCollection<T>(coll);
diff --git a/src/main/java/org/apache/commons/collections4/collection/TransformedCollection.java b/src/main/java/org/apache/commons/collections4/collection/TransformedCollection.java
index a6b9c0c32..f4940473e 100644
--- a/src/main/java/org/apache/commons/collections4/collection/TransformedCollection.java
+++ b/src/main/java/org/apache/commons/collections4/collection/TransformedCollection.java
@@ -56,6 +56,7 @@ public class TransformedCollection<E> extends AbstractCollectionDecorator<E> {
      * @param transformer  the transformer to use for conversion, must not be null
      * @return a new transformed collection
      * @throws IllegalArgumentException if collection or transformer is null
+     * @since 4.0
      */
     public static <E> TransformedCollection<E> transformingCollection(final Collection<E> coll,
             final Transformer<? super E, ? extends E> transformer) {
diff --git a/src/main/java/org/apache/commons/collections4/collection/UnmodifiableBoundedCollection.java b/src/main/java/org/apache/commons/collections4/collection/UnmodifiableBoundedCollection.java
index a3bca74a3..fcdc0462f 100644
--- a/src/main/java/org/apache/commons/collections4/collection/UnmodifiableBoundedCollection.java
+++ b/src/main/java/org/apache/commons/collections4/collection/UnmodifiableBoundedCollection.java
@@ -52,6 +52,7 @@ public final class UnmodifiableBoundedCollection<E> extends AbstractCollectionDe
      * @param coll  the <code>BoundedCollection</code> to decorate, must not be null
      * @return a new unmodifiable bounded collection
      * @throws IllegalArgumentException if {@code coll} is {@code null}
+     * @since 4.0
      */
     public static <E> BoundedCollection<E> unmodifiableBoundedCollection(final BoundedCollection<E> coll) {
         return new UnmodifiableBoundedCollection<E>(coll);
@@ -67,6 +68,7 @@ public final class UnmodifiableBoundedCollection<E> extends AbstractCollectionDe
      * @param coll  the <code>BoundedCollection</code> to decorate, must not be null
      * @return a new unmodifiable bounded collection
      * @throws IllegalArgumentException if {@code coll} is {@code null}
+     * @since 4.0
      */
     @SuppressWarnings("unchecked")
     public static <E> BoundedCollection<E> unmodifiableBoundedCollection(Collection<? extends E> coll) {
diff --git a/src/main/java/org/apache/commons/collections4/collection/UnmodifiableCollection.java b/src/main/java/org/apache/commons/collections4/collection/UnmodifiableCollection.java
index 0b9fc1ed1..d166cd918 100644
--- a/src/main/java/org/apache/commons/collections4/collection/UnmodifiableCollection.java
+++ b/src/main/java/org/apache/commons/collections4/collection/UnmodifiableCollection.java
@@ -49,6 +49,7 @@ public final class UnmodifiableCollection<E>
      * @param coll  the collection to decorate, must not be null
      * @return an unmodifiable collection
      * @throws IllegalArgumentException if collection is null
+     * @since 4.0
      */
     public static <T> Collection<T> unmodifiableCollection(final Collection<T> coll) {
         if (coll instanceof Unmodifiable) {