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src/test/java/org/apache/commons/collections4/list/DefaultAbstractLinkedListForJava21Test.java

@@ -49,6 +49,12 @@ private void readObject(final ObjectInputStream in) throws IOException, ClassNot
             doReadObject(in);
         }
 
+        /**
+         * Serializes this object to an ObjectOutputStream.
+         *
+         * @param out the target ObjectOutputStream.
+         * @throws IOException thrown when an I/O errors occur writing to the target stream.
+         */
         private void writeObject(final ObjectOutputStream out) throws IOException {
             out.defaultWriteObject();
             doWriteObject(out);