Javadoc.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/codec/trunk@1744341 13f79535-47bb-0310-9956-ffa450edef68

Author: garydgregory

src/main/java/org/apache/commons/codec/digest/MessageDigestAlgorithms.java

@@ -50,6 +50,12 @@ public class MessageDigestAlgorithms {
      */
     public static final String SHA_1 = "SHA-1";
 
+    /**
+     * The SHA-224 hash algorithm defined in the FIPS PUB 180-3.
+     * <p>
+     * Present in Oracle Java 8.
+     * </p>
+     */
     public static final String SHA_224 = "SHA_224";
 
     /**