diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/storage/dfs/DfsObjDatabase.java b/org.eclipse.jgit/src/org/eclipse/jgit/storage/dfs/DfsObjDatabase.java
index b1290d955..32244c1b0 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/storage/dfs/DfsObjDatabase.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/storage/dfs/DfsObjDatabase.java
@@ -423,7 +423,8 @@ public abstract class DfsObjDatabase extends ObjectDatabase {
 		return forReuse;
 	}
 
-	void clearCache() {
+	/** Clears the cached list of packs, forcing them to be scanned again. */
+	protected void clearCache() {
 		packList.set(NO_PACKS);
 	}
 
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/storage/dfs/DfsPackFile.java b/org.eclipse.jgit/src/org/eclipse/jgit/storage/dfs/DfsPackFile.java
index 419e1e872..daad02a14 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/storage/dfs/DfsPackFile.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/storage/dfs/DfsPackFile.java
@@ -272,7 +272,19 @@ public final class DfsPackFile {
 		}
 	}
 
-	boolean hasObject(DfsReader ctx, AnyObjectId id) throws IOException {
+	/**
+	 * Check if an object is stored within this pack.
+	 *
+	 * @param ctx
+	 *            reader context to support reading from the backing store if
+	 *            the index is not already loaded in memory.
+	 * @param id
+	 *            object to be located.
+	 * @return true if the object exists in this pack; false if it does not.
+	 * @throws IOException
+	 *             the pack index is not available, or is corrupt.
+	 */
+	public boolean hasObject(DfsReader ctx, AnyObjectId id) throws IOException {
 		final long offset = idx(ctx).findOffset(id);
 		return 0 < offset && !isCorrupt(offset);
 	}
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/storage/dfs/DfsReader.java b/org.eclipse.jgit/src/org/eclipse/jgit/storage/dfs/DfsReader.java
index 3e2a0ad5c..6a76258ed 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/storage/dfs/DfsReader.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/storage/dfs/DfsReader.java
@@ -90,7 +90,13 @@ import org.eclipse.jgit.storage.pack.PackOutputStream;
 import org.eclipse.jgit.storage.pack.PackWriter;
 import org.eclipse.jgit.util.BlockList;
 
-final class DfsReader extends ObjectReader implements ObjectReuseAsIs {
+/**
+ * Reader to access repository content through.
+ * <p>
+ * See the base {@link ObjectReader} documentation for details. Notably, a
+ * reader is not thread safe.
+ */
+public final class DfsReader extends ObjectReader implements ObjectReuseAsIs {
 	/** Temporary buffer large enough for at least one raw object id. */
 	final byte[] tempId = new byte[OBJECT_ID_LENGTH];