diff --git a/docs/source/conf.py b/docs/source/conf.py
index ddc63a87..46210e54 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -31,8 +31,12 @@
 import sphinx_rtd_theme  # noqa
 
 # path to .pyi files w/o having them installed
-print(f"+++++++++++++++++ {os.path.join(os.path.dirname(os.path.abspath(__file__)), '../../src')}")
-sys.path.insert(0, os.path.join(os.path.dirname(os.path.abspath(__file__)), '../../src'))
+print(
+    f"+++++++++++++++++ {os.path.join(os.path.dirname(os.path.abspath(__file__)), '../../src')}"
+)
+sys.path.insert(
+    0, os.path.join(os.path.dirname(os.path.abspath(__file__)), "../../src")
+)
 
 # -- General configuration ------------------------------------------------