diff --git a/README.md b/README.md
index f5a285a..27aa2d1 100644
--- a/README.md
+++ b/README.md
@@ -78,6 +78,17 @@ Execute tests:
 $ bundle exec turbo_tests
 ```
 
+To enable support for RSpec Junit formatting (ie for CircleCI), include `rspec_junit_formatter` in Gemfile, and pass the `-r rspec_junit_formatter` option. Output will be written to `rspec/rspec#{TEST_ENV_NUMBER}.xml` files. Update your Circle CI config:
+
+```yml
+# .circleci/config.yml
+- run: 
+    name: RSpec
+    command: bundle exec turbo_tests -r rspec_junit_formatter
+- store_test_results:
+    path: rspec
+```
+
 Show help:
 
 ```bash
diff --git a/lib/turbo_tests/runner.rb b/lib/turbo_tests/runner.rb
index 026d593..e123311 100644
--- a/lib/turbo_tests/runner.rb
+++ b/lib/turbo_tests/runner.rb
@@ -155,11 +155,21 @@ def start_subprocess(env, extra_args, tests, process_id, record_runtime:)
           []
         end
 
+        junit_options = if defined?(RspecJunitFormatter)
+          [
+            "--format", "RspecJunitFormatter",
+            "--out", "rspec/rspec#{process_id}.xml"
+          ]
+        else
+          []
+        end
+
         command = [
           *command_name,
           *extra_args,
           *seed_option,
           "--format", "TurboTests::JsonRowsFormatter",
+          *junit_options,
           *record_runtime_options,
           *tests,
         ]