diff --git a/lib/ex_unit/lib/ex_unit.ex b/lib/ex_unit/lib/ex_unit.ex
index 4c60a495cb2..fbe3b40eb22 100644
--- a/lib/ex_unit/lib/ex_unit.ex
+++ b/lib/ex_unit/lib/ex_unit.ex
@@ -103,6 +103,8 @@ defmodule ExUnit do
       * `:logs` - the captured logs
       * `:parameters` - the test parameters
 
+    When a test has finished, the following fields are added for consumption by `ExUnit.Formatter` callbacks:
+      * `:test_pid` - the PID that the test was running on
     """
     defstruct [:name, :case, :module, :state, time: 0, tags: %{}, logs: "", parameters: %{}]
 
diff --git a/lib/ex_unit/lib/ex_unit/runner.ex b/lib/ex_unit/lib/ex_unit/runner.ex
index 29bd90d3716..4adda30588a 100644
--- a/lib/ex_unit/lib/ex_unit/runner.ex
+++ b/lib/ex_unit/lib/ex_unit/runner.ex
@@ -456,6 +456,7 @@ defmodule ExUnit.Runner do
   end
 
   defp receive_test_reply(test, test_pid, test_ref, timeout) do
+    test = Map.put(test, :test_pid, test_pid)
     receive do
       {^test_pid, :test_finished, test} ->
         Process.demonitor(test_ref, [:flush])