1 files changed, 12 insertions, 4 deletions
diff --git a/src/classes/com/sun/opengl/util/FileUtil.java b/src/classes/com/sun/opengl/util/FileUtil.java
index 6ff3e2bbd..2971de636 100755
--- a/src/classes/com/sun/opengl/util/FileUtil.java
+++ b/src/classes/com/sun/opengl/util/FileUtil.java
@@ -47,10 +47,14 @@ public class FileUtil {
   private FileUtil() {}
 
   /**
-   * Returns the suffix of the given file name for identifying the
-   * file to the configured TextureProviders.
+   * Returns the lowercase suffix of the given file name (the text
+   * after the last '.' in the file name). Returns null if the file
+   * name has no suffix. Only operates on the given file name;
+   * performs no I/O operations.
    *
    * @param file name of the file
+   * @return lowercase suffix of the file name
+   * @throws NullPointerException if file is null
    */
 
   public static String getFileSuffix(File file) {
@@ -58,10 +62,14 @@ public class FileUtil {
   }
 
   /**
-   * Returns the suffix of the given file name for identifying the
-   * file to the configured TextureProviders.
+   * Returns the lowercase suffix of the given file name (the text
+   * after the last '.' in the file name). Returns null if the file
+   * name has no suffix. Only operates on the given file name;
+   * performs no I/O operations.
    *
    * @param filename name of the file
+   * @return lowercase suffix of the file name
+   * @throws NullPointerException if filename is null
    */
   public static String getFileSuffix(String filename) {
     int lastDot = filename.lastIndexOf('.');