diff --git a/jedi/evaluate/compiled/subprocess/__init__.py b/jedi/evaluate/compiled/subprocess/__init__.py
index 4b7d16a6..55f3bacc 100644
--- a/jedi/evaluate/compiled/subprocess/__init__.py
+++ b/jedi/evaluate/compiled/subprocess/__init__.py
@@ -234,6 +234,8 @@ class Listener(object):
         except KeyError:
             from jedi.api.environment import InterpreterEnvironment
             evaluator = Evaluator(
+                # The project is not actually needed. Nothing should need to
+                # access it.
                 project=None,
                 environment=InterpreterEnvironment()
             )