diff --git a/src/main/java/difflib/algorithm/myers/DiffNode.java b/src/main/java/difflib/algorithm/myers/DiffNode.java
index 214c032..14fe1ba 100644
--- a/src/main/java/difflib/algorithm/myers/DiffNode.java
+++ b/src/main/java/difflib/algorithm/myers/DiffNode.java
@@ -19,19 +19,6 @@ limitations under the License.
  */
 package difflib.algorithm.myers;
 
-/**
- * <p>
- * Title: </p>
- * <p>
- * Description: </p>
- * <p>
- * Copyright: Copyright (c) 2002</p>
- * <p>
- * Company: </p>
- *
- * @author not attributable
- * @version 1.0
- */
 /**
  * A diffnode in a diffpath.
  * <p>
diff --git a/src/main/java/difflib/algorithm/myers/MyersDiff.java b/src/main/java/difflib/algorithm/myers/MyersDiff.java
index 7f07ab2..a893b6d 100644
--- a/src/main/java/difflib/algorithm/myers/MyersDiff.java
+++ b/src/main/java/difflib/algorithm/myers/MyersDiff.java
@@ -45,7 +45,7 @@ import java.util.List;
  * @author <a href="mailto:juanco@suigeneris.org">Juanco Anez</a>
  * @param T The type of the compared elements in the 'lines'.
  */
-public class MyersDiff<T> implements DiffAlgorithm<T> {
+public final class MyersDiff<T> implements DiffAlgorithm<T> {
 
     /**
      * Default equalizer.
@@ -117,7 +117,7 @@ public class MyersDiff<T> implements DiffAlgorithm<T> {
      * @return A minimum {@link PathNode Path} accross the differences graph.
      * @throws DifferentiationFailedException if a diff path could not be found.
      */
-    public PathNode buildPath(final List<T> orig, final List<T> rev)
+    private PathNode buildPath(final List<T> orig, final List<T> rev)
             throws DifferentiationFailedException {
         if (orig == null) {
             throw new IllegalArgumentException("original sequence is null");
@@ -192,7 +192,7 @@ public class MyersDiff<T> implements DiffAlgorithm<T> {
      * @throws DifferentiationFailedException if a {@link Patch} could not be built from the given
      * path.
      */
-    public Patch<T> buildRevision(PathNode path, List<T> orig, List<T> rev) {
+    private Patch<T> buildRevision(PathNode path, List<T> orig, List<T> rev) {
         if (path == null) {
             throw new IllegalArgumentException("path is null");
         }
diff --git a/src/main/java/difflib/algorithm/myers/PathNode.java b/src/main/java/difflib/algorithm/myers/PathNode.java
index 4a0f43f..de1a2dd 100644
--- a/src/main/java/difflib/algorithm/myers/PathNode.java
+++ b/src/main/java/difflib/algorithm/myers/PathNode.java
@@ -96,7 +96,7 @@ public abstract class PathNode {
      */
     @Override
     public String toString() {
-        StringBuffer buf = new StringBuffer("[");
+        StringBuilder buf = new StringBuilder("[");
         PathNode node = this;
         while (node != null) {
             buf.append("(");