diff --git a/pytest-embedded-idf/pytest_embedded_idf/__init__.py b/pytest-embedded-idf/pytest_embedded_idf/__init__.py
index e25e1f2f..eac2145a 100644
--- a/pytest-embedded-idf/pytest_embedded_idf/__init__.py
+++ b/pytest-embedded-idf/pytest_embedded_idf/__init__.py
@@ -17,8 +17,8 @@
         'CaseTester': CaseTester,
     },
     {
-        'IdfSerial': '.serial',
-        'IdfDut': '.dut',
+        'IdfSerial': '.serial',  # requires esp
+        'IdfDut': '.dut',  # requires esp
     },
 )