diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 6600ff2ef..09d5b7357 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -8,7 +8,8 @@ on:
       - trying
   pull_request:
     branches:
-      - master
+      - mbedtls-3
+      - main
       - 'v0.*'
   merge_group:
 
diff --git a/README.md b/README.md
index a83370e5f..2d3bc7ca3 100644
--- a/README.md
+++ b/README.md
@@ -16,8 +16,11 @@ used in a no_std environment.
 
 ## Change of status
 
-We discovered that `mbedtls 3.X` is not thread safe and will not work properly with multiple threads.
-And the new PSA approach does not match our needs. So we now decided to stay on mbedtls `2.28.X`; and the state of this repertory is changed to maintenance. We will not accept any more feature requests.
+We discovered that `mbedtls 3.4.X` is not thread safe and will not work properly with multiple threads. This problem will not be fixed in short time. And the new PSA approach does not match our needs.
+
+So we now decided to stay on mbedtls `2.28.X`; and the state of this repertory is changed to maintenance. We will not accept any more feature requests.
+
+Old code of `mbedtls 3.X` on `master` branch has been moved to branch `mbedtls-3`.
 
 Related issue: [#320](https://github.com/fortanix/rust-mbedtls/issues/320)