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-rw-r--r--src/bootstrap/bootstrap.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/bootstrap/bootstrap.py b/src/bootstrap/bootstrap.py
index 95aa2e992dd..89415afbe3b 100644
--- a/src/bootstrap/bootstrap.py
+++ b/src/bootstrap/bootstrap.py
@@ -1301,6 +1301,8 @@ def bootstrap(args):
     args = [build.bootstrap_binary()]
     args.extend(sys.argv[1:])
     env = os.environ.copy()
+    # The Python process ID is used when creating a Windows job object
+    # (see src\bootstrap\src\utils\job.rs)
     env["BOOTSTRAP_PARENT_ID"] = str(os.getpid())
     env["BOOTSTRAP_PYTHON"] = sys.executable
     run(args, env=env, verbose=build.verbose, is_bootstrap=True)