diff --git a/src/Core/WinSWCore/Extensions/ExtensionPointAttribute.cs b/src/Core/WinSWCore/Extensions/ExtensionPointAttribute.cs
new file mode 100644
index 0000000..61a4e11
--- /dev/null
+++ b/src/Core/WinSWCore/Extensions/ExtensionPointAttribute.cs
@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace winsw.Extensions
+{
+    /// <summary>
+    /// This attribute is used to identify extension points within the code
+    /// </summary>
+    /// <remarks>
+    /// Each extension point implements its own entry type.
+    /// </remarks>
+    class ExtensionPointAttribute
+    {
+    }
+}
diff --git a/src/Core/WinSWCore/Extensions/IWinSWExtension.cs b/src/Core/WinSWCore/Extensions/IWinSWExtension.cs
index 23f1b80..c114381 100644
--- a/src/Core/WinSWCore/Extensions/IWinSWExtension.cs
+++ b/src/Core/WinSWCore/Extensions/IWinSWExtension.cs
@@ -7,7 +7,10 @@ namespace winsw.Extensions
     /// <summary>
     /// Interface for Win Service Wrapper Extension
     /// </summary>
-    /// <remarks>All implementations should provide the default empty constructor. The initialization will be performed by Init methods</remarks>
+    /// <remarks>
+    /// All implementations should provide the default empty constructor. 
+    /// The initialization will be performed by Init methods
+    /// </remarks>
     public interface IWinSWExtension
     {
         /// <summary>
@@ -28,7 +31,7 @@ namespace winsw.Extensions
         void Configure(ServiceDescriptor descriptor, XmlNode node, IEventWriter logger);
 
         /// <summary>
-        /// Start handler. Called during start of the service
+        /// Start handler. Called during startup of the service before the child process.
         /// </summary>
         /// <param name="logger">Logger</param>
         /// <exception cref="ExtensionException">Any error during execution</exception>
diff --git a/src/Core/WinSWCore/Extensions/WinSWExtensionDescriptor.cs b/src/Core/WinSWCore/Extensions/WinSWExtensionDescriptor.cs
index b659fee..3d58c73 100644
--- a/src/Core/WinSWCore/Extensions/WinSWExtensionDescriptor.cs
+++ b/src/Core/WinSWCore/Extensions/WinSWExtensionDescriptor.cs
@@ -4,6 +4,12 @@ using winsw.Util;
 
 namespace winsw.Extensions
 {
+    /// <summary>
+    /// Describes WinSW extensions in <see cref="IWinSWExtension"/>
+    /// </summary>
+    /// <remarks>
+    /// Any extension has its own descriptor instance.
+    /// </remarks>
     public class WinSWExtensionDescriptor
     {
         /// <summary>
diff --git a/src/Core/WinSWCore/WinSWCore.csproj b/src/Core/WinSWCore/WinSWCore.csproj
index 18970be..6ea87bb 100644
--- a/src/Core/WinSWCore/WinSWCore.csproj
+++ b/src/Core/WinSWCore/WinSWCore.csproj
@@ -51,6 +51,7 @@
     <Compile Include="DynamicProxy.cs" />
     <Compile Include="Extensions\AbstractWinSWExtension.cs" />
     <Compile Include="Extensions\ExtensionException.cs" />
+    <Compile Include="Extensions\ExtensionPointAttribute.cs" />
     <Compile Include="Extensions\IWinSWExtension.cs" />
     <Compile Include="Extensions\WinSWExtensionDescriptor.cs" />
     <Compile Include="Extensions\WinSWExtensionManager.cs" />
diff --git a/src/Core/WinSWCore/packages.config b/src/Core/WinSWCore/packages.config
new file mode 100644
index 0000000..7a2c004
--- /dev/null
+++ b/src/Core/WinSWCore/packages.config
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="log4net" version="2.0.3" targetFramework="net20" />
+</packages>
\ No newline at end of file