add some more comments

git-svn-id: https://svn.apache.org/repos/asf/maven/repository-manager/trunk@365548 13f79535-47bb-0310-9956-ffa450edef68

maven-repository-indexer/src/main/java/org/apache/maven/repository/indexing/ArtifactRepositoryIndex.java

@@ -37,6 +37,8 @@ import java.util.zip.ZipFile;
  *
  * @author Edwin Punzalan
  * @plexus.component role="org.apache.maven.repository.indexing.RepositoryIndex" role-hint="artifact" instantiation-strategy="per-lookup"
+ * @todo I think we should merge with Abstract*. Don't see that there'd be multiple implementations based on this
+ * @todo I think we should instantiate this based on a repository from a factory instead of making it a component of its own
  */
 public class ArtifactRepositoryIndex
     extends AbstractRepositoryIndex