tweak readme

diff --git a/README.md b/README.md
index 8415bed..f575db3 100644
--- a/README.md
+++ b/README.md

@@ -2,8 +2,11 @@
 
 > [!WARNING]
 > This feature has been upstreamed into protobuf@33.4
-> Just set --@protobuf//bazel/toolchains:prefer_prebuilt_protoc
-> (And prior to Bazel 9, also set --incompatible_enable_proto_toolchain_resolution)
+>
+> After upgrading, just set
+> `--@protobuf//bazel/toolchains:prefer_prebuilt_protoc`
+> (And prior to Bazel 9, also set
+> `--incompatible_enable_proto_toolchain_resolution`)
 
 _#NeverCompileProtocAgain_