diff --git a/docs/en/docs/how-to/custom-docs-ui-assets.md b/docs/en/docs/how-to/custom-docs-ui-assets.md
index 91228c8c9..61a97dca2 100644
--- a/docs/en/docs/how-to/custom-docs-ui-assets.md
+++ b/docs/en/docs/how-to/custom-docs-ui-assets.md
@@ -18,7 +18,7 @@ The first step is to disable the automatic docs, as by default, those use the de
 
 To disable them, set their URLs to `None` when creating your `FastAPI` app:
 
-{* ../../docs_src/custom_docs_ui/tutorial001.py hl[8] *}
+{* ../../docs_src/custom_docs_ui/tutorial001_py39.py hl[8] *}
 
 ### Include the custom docs { #include-the-custom-docs }
 
@@ -34,7 +34,7 @@ You can reuse FastAPI's internal functions to create the HTML pages for the docs
 
 And similarly for ReDoc...
 
-{* ../../docs_src/custom_docs_ui/tutorial001.py hl[2:6,11:19,22:24,27:33] *}
+{* ../../docs_src/custom_docs_ui/tutorial001_py39.py hl[2:6,11:19,22:24,27:33] *}
 
 /// tip
 
@@ -50,7 +50,7 @@ Swagger UI will handle it behind the scenes for you, but it needs this "redirect
 
 Now, to be able to test that everything works, create a *path operation*:
 
-{* ../../docs_src/custom_docs_ui/tutorial001.py hl[36:38] *}
+{* ../../docs_src/custom_docs_ui/tutorial001_py39.py hl[36:38] *}
 
 ### Test it { #test-it }
 
@@ -118,7 +118,7 @@ After that, your file structure could look like:
 * Import `StaticFiles`.
 * "Mount" a `StaticFiles()` instance in a specific path.
 
-{* ../../docs_src/custom_docs_ui/tutorial002.py hl[7,11] *}
+{* ../../docs_src/custom_docs_ui/tutorial002_py39.py hl[7,11] *}
 
 ### Test the static files { #test-the-static-files }
 
@@ -144,7 +144,7 @@ The same as when using a custom CDN, the first step is to disable the automatic
 
 To disable them, set their URLs to `None` when creating your `FastAPI` app:
 
-{* ../../docs_src/custom_docs_ui/tutorial002.py hl[9] *}
+{* ../../docs_src/custom_docs_ui/tutorial002_py39.py hl[9] *}
 
 ### Include the custom docs for static files { #include-the-custom-docs-for-static-files }
 
@@ -160,7 +160,7 @@ Again, you can reuse FastAPI's internal functions to create the HTML pages for t
 
 And similarly for ReDoc...
 
-{* ../../docs_src/custom_docs_ui/tutorial002.py hl[2:6,14:22,25:27,30:36] *}
+{* ../../docs_src/custom_docs_ui/tutorial002_py39.py hl[2:6,14:22,25:27,30:36] *}
 
 /// tip
 
@@ -176,7 +176,7 @@ Swagger UI will handle it behind the scenes for you, but it needs this "redirect
 
 Now, to be able to test that everything works, create a *path operation*:
 
-{* ../../docs_src/custom_docs_ui/tutorial002.py hl[39:41] *}
+{* ../../docs_src/custom_docs_ui/tutorial002_py39.py hl[39:41] *}
 
 ### Test Static Files UI { #test-static-files-ui }
 
diff --git a/docs_src/custom_docs_ui/tutorial001.py b/docs_src/custom_docs_ui/tutorial001_py39.py
similarity index 100%
rename from docs_src/custom_docs_ui/tutorial001.py
rename to docs_src/custom_docs_ui/tutorial001_py39.py
diff --git a/docs_src/custom_docs_ui/tutorial002.py b/docs_src/custom_docs_ui/tutorial002_py39.py
similarity index 100%
rename from docs_src/custom_docs_ui/tutorial002.py
rename to docs_src/custom_docs_ui/tutorial002_py39.py
diff --git a/tests/test_tutorial/test_custom_docs_ui/test_tutorial001.py b/tests/test_tutorial/test_custom_docs_ui/test_tutorial001.py
index cb8e8c224..1816e5d97 100644
--- a/tests/test_tutorial/test_custom_docs_ui/test_tutorial001.py
+++ b/tests/test_tutorial/test_custom_docs_ui/test_tutorial001.py
@@ -10,7 +10,7 @@ def client():
     static_dir: Path = Path(os.getcwd()) / "static"
     print(static_dir)
     static_dir.mkdir(exist_ok=True)
-    from docs_src.custom_docs_ui.tutorial001 import app
+    from docs_src.custom_docs_ui.tutorial001_py39 import app
 
     with TestClient(app) as client:
         yield client
diff --git a/tests/test_tutorial/test_custom_docs_ui/test_tutorial002.py b/tests/test_tutorial/test_custom_docs_ui/test_tutorial002.py
index 712618807..e8b7eb7aa 100644
--- a/tests/test_tutorial/test_custom_docs_ui/test_tutorial002.py
+++ b/tests/test_tutorial/test_custom_docs_ui/test_tutorial002.py
@@ -10,7 +10,7 @@ def client():
     static_dir: Path = Path(os.getcwd()) / "static"
     print(static_dir)
     static_dir.mkdir(exist_ok=True)
-    from docs_src.custom_docs_ui.tutorial002 import app
+    from docs_src.custom_docs_ui.tutorial002_py39 import app
 
     with TestClient(app) as client:
         yield client