diff --git a/README.md b/README.md
index 7783e2b..ed859ee 100644
--- a/README.md
+++ b/README.md
@@ -26,6 +26,13 @@ The bindings are generated from WinMD files, found in NuGet packages on Nuget.or
 Please file any issues you have with this repository on https://github.com/thebrowsercompany/swift-winrt
 
 ## Known Issues and Limitations
+
+- Only x64 architecture is supported right now
+
 - The developer experience for consuming WinRT APIs from Swift is a work in progress. Due to current limitations, not all APIs can be generated as this causes export limit issues.
 
 - The APIs listed in projections.json are required for the other `swift-*` projects to build. Modify a projections.json in any one of those projects could require an update here.
+
+## Using Windows App SDK
+
+In order to use the Windows App SDK, you need to download the Windows App SDK from here: https://aka.ms/windowsappsdk/1.5/1.5.240205001-preview1/windowsappruntimeinstall-x64.exe
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