diff --git a/spring-core/src/main/java/org/springframework/util/FastByteArrayOutputStream.java b/spring-core/src/main/java/org/springframework/util/FastByteArrayOutputStream.java
index 3fa6fcf69a..3229175ea4 100644
--- a/spring-core/src/main/java/org/springframework/util/FastByteArrayOutputStream.java
+++ b/spring-core/src/main/java/org/springframework/util/FastByteArrayOutputStream.java
@@ -24,7 +24,9 @@ import java.util.Iterator;
 import java.util.LinkedList;
 
 /**
- * A speedy alternative to {@link java.io.ByteArrayOutputStream}.
+ * A speedy alternative to {@link java.io.ByteArrayOutputStream}. Note that
+ * this variant does <i>not</i> extend {@code ByteArrayOutputStream}, unlike
+ * its sibling {@link ResizableByteArrayOutputStream}.
  *
  * <p>Unlike {@link java.io.ByteArrayOutputStream}, this implementation is backed
  * by a {@link java.util.LinkedList} of {@code byte[]} instead of 1 constantly
@@ -35,9 +37,12 @@ import java.util.LinkedList;
  * with the {@link #writeTo(OutputStream)} method.
  *
  * @author Craig Andrews
+ * @author Juergen Hoeller
  * @since 4.2
+ * @see #resize
+ * @see ResizableByteArrayOutputStream
  */
-public final class FastByteArrayOutputStream extends OutputStream {
+public class FastByteArrayOutputStream extends OutputStream {
 
 	private static final int DEFAULT_BLOCK_SIZE = 256;
 
diff --git a/spring-core/src/main/java/org/springframework/util/ResizableByteArrayOutputStream.java b/spring-core/src/main/java/org/springframework/util/ResizableByteArrayOutputStream.java
index b42aa17c55..cb2cdfa284 100644
--- a/spring-core/src/main/java/org/springframework/util/ResizableByteArrayOutputStream.java
+++ b/spring-core/src/main/java/org/springframework/util/ResizableByteArrayOutputStream.java
@@ -35,6 +35,8 @@ import java.io.ByteArrayOutputStream;
  * @author Brian Clozel
  * @author Juergen Hoeller
  * @since 4.0.3
+ * @see #resize
+ * @see FastByteArrayOutputStream
  */
 public class ResizableByteArrayOutputStream extends ByteArrayOutputStream {
 
diff --git a/spring-web/src/main/java/org/springframework/web/util/ContentCachingResponseWrapper.java b/spring-web/src/main/java/org/springframework/web/util/ContentCachingResponseWrapper.java
index 314f33327d..eee6d8eb6a 100644
--- a/spring-web/src/main/java/org/springframework/web/util/ContentCachingResponseWrapper.java
+++ b/spring-web/src/main/java/org/springframework/web/util/ContentCachingResponseWrapper.java
@@ -170,6 +170,7 @@ public class ContentCachingResponseWrapper extends HttpServletResponseWrapper {
 
 	/**
 	 * Return an {@link InputStream} to the cached content.
+	 * @since 4.2
 	 */
 	public InputStream getContentInputStream(){
 		return this.content.getInputStream();
@@ -177,6 +178,7 @@ public class ContentCachingResponseWrapper extends HttpServletResponseWrapper {
 
 	/**
 	 * Return the current size of the cached content.
+	 * @since 4.2
 	 */
 	public int getContentSize(){
 		return this.content.size();
@@ -184,6 +186,7 @@ public class ContentCachingResponseWrapper extends HttpServletResponseWrapper {
 
 	/**
 	 * Copy the complete cached body content to the response.
+	 * @since 4.2
 	 */
 	public void copyBodyToResponse() throws IOException {
 		copyBodyToResponse(true);
@@ -193,6 +196,7 @@ public class ContentCachingResponseWrapper extends HttpServletResponseWrapper {
 	 * Copy the cached body content to the response.
 	 * @param complete whether to set a corresponding content length
 	 * for the complete cached body content
+	 * @since 4.2
 	 */
 	protected void copyBodyToResponse(boolean complete) throws IOException {
 		if (this.content.size() > 0) {