Update readme

CMakeLists.txt

@@ -182,7 +182,7 @@ if( NO_THIRDPARTY_CONTAINERS )
 	message("-- No third-party containers will be used: Make sure to #define RMLUI_NO_THIRDPARTY_CONTAINERS before including RmlUi in your project.")
 endif()
 
-option(ENABLE_TRACY_PROFILING "Enable profiling with Tracy. It is recommended to place source files in Dependencies/tracy." OFF)
+option(ENABLE_TRACY_PROFILING "Enable profiling with Tracy. Source files can be placed in Dependencies/tracy." OFF)
 if( ENABLE_TRACY_PROFILING )
 	find_package(Tracy REQUIRED)
 

readme.md

@@ -14,6 +14,8 @@ RmlUi uses the time-tested open standards XHTML1.0 and CSS2.0 while borrowing fe
 
 Documentation is located at https://mikke89.github.io/RmlUiDoc/
 
+*Note:* RmlUi 4.0 currently in development is a restructuring of RmlUi 3.x. This includes changes to the namespaces, plugins, and include headers. Take a look at the [changelog](changelog.md#restructuring-rmlui) for a summary of changes and an upgrade guide.
+
 ## Features
 
 - Cross platform architecture: Windows, macOS, Linux, iOS, etc.