diff --git a/core/java/android/webkit/CacheManager.java b/core/java/android/webkit/CacheManager.java
index 910d7b2cfe773..c167414120034 100644
--- a/core/java/android/webkit/CacheManager.java
+++ b/core/java/android/webkit/CacheManager.java
@@ -74,6 +74,11 @@ public final class CacheManager {
     // Flag to clear the cache when the CacheManager is initialized
     private static boolean mClearCacheOnInit = false;
 
+    /**
+     * This class represents a resource retrieved from the HTTP cache.
+     * Instances of this class can be obtained by invoking the
+     * CacheManager.getCacheFile() method.
+     */
     public static class CacheResult {
         // these fields are saved to the database
         int httpStatusCode;
diff --git a/core/java/android/webkit/WebChromeClient.java b/core/java/android/webkit/WebChromeClient.java
index 6adac0bc65d80..dd494e1ed0b0b 100644
--- a/core/java/android/webkit/WebChromeClient.java
+++ b/core/java/android/webkit/WebChromeClient.java
@@ -266,20 +266,25 @@ public class WebChromeClient {
     public void addMessageToConsole(String message, int lineNumber, String sourceID) {}
 
     /**
-     * Ask the host application for an icon to represent a <video> element.
-     * This icon will be used if the Web page did not specify a poster attribute.
+     * When not playing, video elements are represented by a 'poster' image. The
+     * image to use can be specified by the poster attribute of the video tag in
+     * HTML. If the attribute is absent, then a default poster will be used. This
+     * method allows the ChromeClient to provide that default image.
      *
-     * @return Bitmap The icon or null if no such icon is available.
+     * @return Bitmap The image to use as a default poster, or null if no such image is
+     * available.
      */
     public Bitmap getDefaultVideoPoster() {
         return null;
     }
 
     /**
-     * Ask the host application for a custom progress view to show while
-     * a <video> is loading.
+     * When the user starts to playback a video element, it may take time for enough
+     * data to be buffered before the first frames can be rendered. While this buffering
+     * is taking place, the ChromeClient can use this function to provide a View to be
+     * displayed. For example, the ChromeClient could show a spinner animation.
      *
-     * @return View The progress view.
+     * @return View The View to be displayed whilst the video is loading.
      */
     public View getVideoLoadingProgressView() {
         return null;