Mention Factory in comparison blurb

README.md

@@ -155,6 +155,8 @@ SafeDI’s compile-time-safe design makes it similar to [Needle](https://github.
 
 Other Swift DI libraries like [Swinject](https://github.com/Swinject/Swinject) and [Cleanse](https://github.com/square/Cleanse) do not offer compile-time safety, though other features are similar. A primary benefit of the SafeDI library is that compilation validates your dependency tree.
 
+Meanwhile, libraries like [Factory](https://github.com/hmlongco/Factory) offer compile-time validation of the dependency tree, but do so by preventing hierarchical dependency scoping, meaning that it’s not possible for scoped systems to have compile-time-safe, non-optional access to scoped dependencies.
+
 To read about on how SafeDI compares to manual injection, please refer to the [Key Differences section of the manual](Documentation/Manual.md#comparing-safedi-and-manual-injection-key-differences).
 
 ## Acknowledgements