diff --git a/samples/BindingDemo/App.xaml.cs b/samples/BindingDemo/App.xaml.cs
index 01c52a2a49..f2f44cd502 100644
--- a/samples/BindingDemo/App.xaml.cs
+++ b/samples/BindingDemo/App.xaml.cs
@@ -3,6 +3,7 @@ using Avalonia;
 using Avalonia.Controls;
 using Avalonia.Logging.Serilog;
 using Avalonia.Markup.Xaml;
+using Avalonia.ReactiveUI;
 using Serilog;
 
 namespace BindingDemo
diff --git a/samples/ControlCatalog.Desktop/Program.cs b/samples/ControlCatalog.Desktop/Program.cs
index dd5644dd6b..b7aa34f5ba 100644
--- a/samples/ControlCatalog.Desktop/Program.cs
+++ b/samples/ControlCatalog.Desktop/Program.cs
@@ -4,6 +4,7 @@ using Avalonia;
 using Avalonia.Controls;
 using Avalonia.Logging.Serilog;
 using Avalonia.Platform;
+using Avalonia.ReactiveUI;
 using Serilog;
 
 namespace ControlCatalog
diff --git a/samples/ControlCatalog.NetCore/Program.cs b/samples/ControlCatalog.NetCore/Program.cs
index d13a5b5ef3..c8f3fb9921 100644
--- a/samples/ControlCatalog.NetCore/Program.cs
+++ b/samples/ControlCatalog.NetCore/Program.cs
@@ -4,6 +4,7 @@ using System.Linq;
 using System.Threading;
 using Avalonia;
 using Avalonia.Skia;
+using Avalonia.ReactiveUI;
 
 namespace ControlCatalog.NetCore
 {
diff --git a/samples/RenderDemo/App.xaml.cs b/samples/RenderDemo/App.xaml.cs
index 0f627961e6..d95018520a 100644
--- a/samples/RenderDemo/App.xaml.cs
+++ b/samples/RenderDemo/App.xaml.cs
@@ -4,6 +4,7 @@
 using Avalonia;
 using Avalonia.Logging.Serilog;
 using Avalonia.Markup.Xaml;
+using Avalonia.ReactiveUI;
 
 namespace RenderDemo
 {
diff --git a/samples/VirtualizationDemo/Program.cs b/samples/VirtualizationDemo/Program.cs
index 98f1f08d6c..9d8f7c1a3d 100644
--- a/samples/VirtualizationDemo/Program.cs
+++ b/samples/VirtualizationDemo/Program.cs
@@ -5,6 +5,7 @@ using System;
 using Avalonia;
 using Avalonia.Controls;
 using Avalonia.Logging.Serilog;
+using Avalonia.ReactiveUI;
 using Serilog;
 
 namespace VirtualizationDemo
diff --git a/src/Avalonia.Base/Utilities/WeakEventHandlerManager.cs b/src/Avalonia.Base/Utilities/WeakEventHandlerManager.cs
index 0ade1af249..b59ed166bc 100644
--- a/src/Avalonia.Base/Utilities/WeakEventHandlerManager.cs
+++ b/src/Avalonia.Base/Utilities/WeakEventHandlerManager.cs
@@ -19,6 +19,7 @@ namespace Avalonia.Utilities
         /// </summary>
         /// <typeparam name="TTarget">The type of the target.</typeparam>
         /// <typeparam name="TEventArgs">The type of the event arguments.</typeparam>
+        /// <typeparam name="TSubscriber">The type of the subscriber.</typeparam>
         /// <param name="target">The event source.</param>
         /// <param name="eventName">The name of the event.</param>
         /// <param name="subscriber">The subscriber.</param>
@@ -40,6 +41,7 @@ namespace Avalonia.Utilities
         /// Unsubscribes from an event.
         /// </summary>
         /// <typeparam name="TEventArgs">The type of the event arguments.</typeparam>
+        /// <typeparam name="TSubscriber">The type of the subscriber.</typeparam>
         /// <param name="target">The event source.</param>
         /// <param name="eventName">The name of the event.</param>
         /// <param name="subscriber">The subscriber.</param>
diff --git a/src/Avalonia.Controls/Window.cs b/src/Avalonia.Controls/Window.cs
index f5af6774b5..c8e09b8f9c 100644
--- a/src/Avalonia.Controls/Window.cs
+++ b/src/Avalonia.Controls/Window.cs
@@ -291,7 +291,8 @@ namespace Avalonia.Controls
         /// </summary>
         /// <param name="dialogResult">The dialog result.</param>
         /// <remarks>
-        /// When the window is shown with the <see cref="ShowDialog{TResult}"/> method, the
+        /// When the window is shown with the <see cref="ShowDialog{TResult}(IWindowImpl)"/>
+        /// or <see cref="ShowDialog{TResult}(Window)"/> method, the
         /// resulting task will produce the <see cref="_dialogResult"/> value when the window
         /// is closed.
         /// </remarks>
diff --git a/src/Avalonia.ReactiveUI/AppBuilderExtensions.cs b/src/Avalonia.ReactiveUI/AppBuilderExtensions.cs
index d763febdf3..f67cb7f40a 100644
--- a/src/Avalonia.ReactiveUI/AppBuilderExtensions.cs
+++ b/src/Avalonia.ReactiveUI/AppBuilderExtensions.cs
@@ -6,10 +6,15 @@ using Avalonia.Threading;
 using ReactiveUI;
 using Splat;
 
-namespace Avalonia
+namespace Avalonia.ReactiveUI
 {
     public static class AppBuilderExtensions
     {
+        /// <summary>
+        /// Initializes ReactiveUI framework to use with Avalonia. Registers Avalonia 
+        /// scheduler and Avalonia activation for view fetcher. Always remember to
+        /// call this method if you are using ReactiveUI in your application.
+        /// </summary>
         public static TAppBuilder UseReactiveUI<TAppBuilder>(this TAppBuilder builder)
             where TAppBuilder : AppBuilderBase<TAppBuilder>, new()
         {
diff --git a/src/Avalonia.ReactiveUI/Attributes.cs b/src/Avalonia.ReactiveUI/Attributes.cs
new file mode 100644
index 0000000000..e908d1de80
--- /dev/null
+++ b/src/Avalonia.ReactiveUI/Attributes.cs
@@ -0,0 +1,8 @@
+// Copyright (c) The Avalonia Project. All rights reserved.
+// Licensed under the MIT license. See licence.md file in the project root for full license information.
+
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using Avalonia.Metadata;
+
+[assembly: XmlnsDefinition("http://reactiveui.net", "Avalonia.ReactiveUI")]
\ No newline at end of file
diff --git a/src/Avalonia.ReactiveUI/AvaloniaActivationForViewFetcher.cs b/src/Avalonia.ReactiveUI/AvaloniaActivationForViewFetcher.cs
index e1db604e95..cfa7a270be 100644
--- a/src/Avalonia.ReactiveUI/AvaloniaActivationForViewFetcher.cs
+++ b/src/Avalonia.ReactiveUI/AvaloniaActivationForViewFetcher.cs
@@ -9,15 +9,24 @@ using Avalonia.VisualTree;
 using Avalonia.Controls;
 using ReactiveUI;
 
-namespace Avalonia
+namespace Avalonia.ReactiveUI
 {
+    /// <summary>
+    /// Determines when Avalonia IVisuals get activated.
+    /// </summary>
     public class AvaloniaActivationForViewFetcher : IActivationForViewFetcher
     {
+        /// <summary>
+        /// Returns affinity for view.
+        /// </summary>
         public int GetAffinityForView(Type view)
         {
             return typeof(IVisual).GetTypeInfo().IsAssignableFrom(view.GetTypeInfo()) ? 10 : 0;
         }
 
+        /// <summary>
+        /// Returns activation observable for activatable Avalonia view.
+        /// </summary>
         public IObservable<bool> GetActivationForView(IActivatable view)
         {
             if (!(view is IVisual visual)) return Observable.Return(false);
@@ -25,6 +34,9 @@ namespace Avalonia
             return GetActivationForVisual(visual);
         }
 
+        /// <summary>
+        /// Listens to Opened and Closed events for Avalonia windows.
+        /// </summary>
         private IObservable<bool> GetActivationForWindowBase(WindowBase window) 
         {
             var windowLoaded = Observable
@@ -42,6 +54,10 @@ namespace Avalonia
                 .DistinctUntilChanged();
         }
 
+        /// <summary>
+        /// Listens to AttachedToVisualTree and DetachedFromVisualTree 
+        /// events for Avalonia IVisuals.
+        /// </summary>
         private IObservable<bool> GetActivationForVisual(IVisual visual) 
         {
             var visualLoaded = Observable
diff --git a/src/Avalonia.ReactiveUI/ReactiveUserControl.cs b/src/Avalonia.ReactiveUI/ReactiveUserControl.cs
index 43e2ef93b6..010acc3ae0 100644
--- a/src/Avalonia.ReactiveUI/ReactiveUserControl.cs
+++ b/src/Avalonia.ReactiveUI/ReactiveUserControl.cs
@@ -6,7 +6,7 @@ using Avalonia.VisualTree;
 using Avalonia.Controls;
 using ReactiveUI;
 
-namespace Avalonia
+namespace Avalonia.ReactiveUI
 {
     /// <summary>
     /// A ReactiveUI UserControl that implements <see cref="IViewFor{TViewModel}"/> 
diff --git a/src/Avalonia.ReactiveUI/ReactiveWindow.cs b/src/Avalonia.ReactiveUI/ReactiveWindow.cs
index bb50a37764..f0f115afbc 100644
--- a/src/Avalonia.ReactiveUI/ReactiveWindow.cs
+++ b/src/Avalonia.ReactiveUI/ReactiveWindow.cs
@@ -6,7 +6,7 @@ using Avalonia.VisualTree;
 using Avalonia.Controls;
 using ReactiveUI;
 
-namespace Avalonia 
+namespace Avalonia.ReactiveUI
 {
     /// <summary>
     /// A ReactiveUI Window that implements <see cref="IViewFor{TViewModel}"/>
diff --git a/src/Avalonia.ReactiveUI/RoutedViewHost.cs b/src/Avalonia.ReactiveUI/RoutedViewHost.cs
index e364d5de0b..4bd86a67c0 100644
--- a/src/Avalonia.ReactiveUI/RoutedViewHost.cs
+++ b/src/Avalonia.ReactiveUI/RoutedViewHost.cs
@@ -1,13 +1,17 @@
+// Copyright (c) The Avalonia Project. All rights reserved.
+// Licensed under the MIT license. See licence.md file in the project root for full license information.
+
 using System;
 using System.Reactive.Disposables;
 using System.Reactive.Linq;
 using Avalonia.Animation;
 using Avalonia.Controls;
 using Avalonia.Styling;
+using Avalonia;
 using ReactiveUI;
 using Splat;
 
-namespace Avalonia
+namespace Avalonia.ReactiveUI
 {
     /// <summary>
     /// This control hosts the View associated with ReactiveUI RoutingState,
@@ -157,7 +161,7 @@ namespace Avalonia
                 return;
             }
     
-            var viewLocator = ViewLocator ?? ReactiveUI.ViewLocator.Current;
+            var viewLocator = ViewLocator ?? global::ReactiveUI.ViewLocator.Current;
             var view = viewLocator.ResolveView(viewModel);
             if (view == null) throw new Exception($"Couldn't find view for '{viewModel}'. Is it registered?");
     
diff --git a/src/Avalonia.Styling/StyledElement.cs b/src/Avalonia.Styling/StyledElement.cs
index e52a1961ba..d314a8d44e 100644
--- a/src/Avalonia.Styling/StyledElement.cs
+++ b/src/Avalonia.Styling/StyledElement.cs
@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Collections.Specialized;
+using System.ComponentModel;
 using System.Linq;
 using System.Reactive.Linq;
 using System.Reactive.Subjects;
diff --git a/tests/Avalonia.ReactiveUI.UnitTests/AvaloniaActivationForViewFetcherTest.cs b/tests/Avalonia.ReactiveUI.UnitTests/AvaloniaActivationForViewFetcherTest.cs
index 70a5504a7d..d9f1ce47dd 100644
--- a/tests/Avalonia.ReactiveUI.UnitTests/AvaloniaActivationForViewFetcherTest.cs
+++ b/tests/Avalonia.ReactiveUI.UnitTests/AvaloniaActivationForViewFetcherTest.cs
@@ -11,6 +11,7 @@ using DynamicData;
 using Xunit;
 using Splat;
 using Avalonia.Markup.Xaml;
+using Avalonia.ReactiveUI;
 
 namespace Avalonia 
 {
diff --git a/tests/Avalonia.ReactiveUI.UnitTests/RoutedViewHostTest.cs b/tests/Avalonia.ReactiveUI.UnitTests/RoutedViewHostTest.cs
index de09a1ea89..401d169896 100644
--- a/tests/Avalonia.ReactiveUI.UnitTests/RoutedViewHostTest.cs
+++ b/tests/Avalonia.ReactiveUI.UnitTests/RoutedViewHostTest.cs
@@ -14,6 +14,7 @@ using Avalonia.Markup.Xaml;
 using System.ComponentModel;
 using System.Threading.Tasks;
 using System.Reactive;
+using Avalonia.ReactiveUI;
 
 namespace Avalonia
 {