diff --git a/llvm/docs/GettingStarted.rst b/llvm/docs/GettingStarted.rst
--- a/llvm/docs/GettingStarted.rst
+++ b/llvm/docs/GettingStarted.rst
@@ -478,6 +478,8 @@
   % cd arcanist
   % git fetch https://github.com/rashkov/arcanist update_cacerts
   % git cherry-pick e3659d43d8911e91739f3b0c5935598bceb859aa
+  % git fetch https://github.com/nickdesaulniers/arcanist/ php_8_1
+  % git cherry-pick 1e2f4b15a87659a17bad5abcdbf73fbc7a02fab8
 
 Once this is all done, you can upload the latest commit using: