diff --git a/Sharp.Augeas.Test/AugeasTests.cs b/Sharp.Augeas.Test/AugeasTests.cs
index e1f2d99..d6ea3bc 100644
--- a/Sharp.Augeas.Test/AugeasTests.cs
+++ b/Sharp.Augeas.Test/AugeasTests.cs
@@ -7,8 +7,8 @@ public class AugeasTests
 {
     private Augeas _augeas;
 
-    private const string EXAMPLE_CONF_1 = "/etc/apache2/sites-available/example.com.conf";
-    private const string EXAMPLE_CONF_2 = "/etc/apache2/sites-available/example2.com.conf";
+    private const string ExampleConf1 = "/etc/apache2/sites-available/example.com.conf";
+    private const string ExampleConf2 = "/etc/apache2/sites-available/example2.com.conf";
 
     private static string RandomString(int length)
     {
@@ -24,21 +24,32 @@ public class AugeasTests
         var rootDir = Environment.CurrentDirectory + "/root";
         var lensDir = Environment.CurrentDirectory + "/lens";
         _augeas = new Augeas(new AugSettings(rootDir, lensDir));
-        _augeas.LoadFile(EXAMPLE_CONF_1);
-        _augeas.LoadFile(EXAMPLE_CONF_2);
+        _augeas.LoadFile(ExampleConf1);
+        _augeas.LoadFile(ExampleConf2);
     }
 
     [Test]
     public void GetTreeHasDirectivesAndArguments()
     {
-        var tree = _augeas.GetTree("VirtualHost", $"/files{EXAMPLE_CONF_1}/VirtualHost/*");
+        var tree = _augeas.GetTree("VirtualHost", $"/files{ExampleConf1}/VirtualHost/*");
         Assert.That(tree.Arguments.Count > 0 && tree.Directives.Count > 0);
     }
 
+    [Test]
+    public void TreeIsChangeable()
+    {
+        var tree = _augeas.GetTree("VirtualHost", $"/files{ExampleConf1}/VirtualHost/*");
+        var directive = tree.GetDirective("ServerName");
+        var newValue = RandomString(10);
+        directive.Set($"ServerName {newValue}");
+        bool save = directive.Save();
+        Assert.That(save);
+    }
+    
     [Test]
     public void NoExceptionThrownWhenPrintingPreview()
     {
-        var virtualHostConfig = EXAMPLE_CONF_1;
+        var virtualHostConfig = ExampleConf1;
         _augeas.PrintPreview(virtualHostConfig);
         Assert.Pass();
     }
@@ -107,4 +118,5 @@ public class AugeasTests
         Assert.That(sites.Length > 0);
     }
 
+
 }
\ No newline at end of file
diff --git a/Sharp.Augeas/Tree/Node.cs b/Sharp.Augeas/Tree/Node.cs
index 090115f..1320006 100644
--- a/Sharp.Augeas/Tree/Node.cs
+++ b/Sharp.Augeas/Tree/Node.cs
@@ -20,6 +20,10 @@ public class Node
         Path = path;
     }
 
+    /// <summary>
+    /// Write all pending changes to disk. Only files that had any changes made to them are written.
+    /// </summary>
+    /// <returns></returns>
     public bool Save()
     {
         return _augeas.Save();