diff --git a/README.md b/README.md
index dfa4d91..c2c5fad 100644
--- a/README.md
+++ b/README.md
@@ -135,7 +135,7 @@ This GitHub Action installs the [CernVM-FS package](https://cernvm.cern.ch/fs/#d
 
 ## Limitations
 
-This GitHub Action is only expected to work in workflows that [run on](https://docs.github.com/en/free-pro-team@latest/actions/reference/workflow-syntax-for-github-actions#jobsjob_idruns-on) ubuntu. There is experimental support for `macOS`.
+This GitHub Action is only expected to work in workflows that [run on](https://docs.github.com/en/free-pro-team@latest/actions/reference/workflow-syntax-for-github-actions#jobsjob_idruns-on) ubuntu. There is experimental support for `macOS` (11+).
 
  `windows` targets are not supported.