diff --git a/README.md b/README.md
index 7af0dc2f..1a902774 100644
--- a/README.md
+++ b/README.md
@@ -22,6 +22,26 @@ With features like the following, Angel is the all-in-one framework you should c
 
 See all the packages in the `packages/` directory.
 
+## Important Notes
+This is a port to get Angel Framework to work with Dart 2.10.x and above. Dart version below 2.10.x is not supported.
+
+Branch: sdk-2.10.x
+- Support dart 2.10.x only. Use sdk: ">=2.10.0 <2.12.0"
+- Status: Working. Not all plugin packages are tested.
+
+Branch: sdk-2.12.x
+- Support dart 2.12.x. Use sdk: ">=2.10.0 <3.0.0"
+- Do not support NNBD 
+- Status: Working. Not all plugin packages are migrated and tested.
+
+Branch: 2.12.x-nnbd
+- Support dart 2.12.x. Use sdk: ">=2.12.0 <3.0.0"
+- Support NNBD
+- Status: To be available once all the dependency libraries support NNBD
+
+New features planned
+- None
+
 ## Installation & Setup
 
 Once you have [Dart](https://www.dartlang.org/) installed, bootstrapping a project is as simple as running a few shell commands: