diff --git a/gitignore.py b/.gitignore
similarity index 100%
rename from gitignore.py
rename to .gitignore
diff --git a/src/matrixmania/compute.py b/src/matrixmania/compute.py
index f5e3d83..7a09f52 100644
--- a/src/matrixmania/compute.py
+++ b/src/matrixmania/compute.py
@@ -102,6 +102,8 @@ def rot_2D(winkel):
         [math.cos(winkel), -math.sin(winkel)],
         [math.sin(winkel), math.cos(winkel)]
     ]
+
+def rot_3D(angle: float, axis: str) -> list[list[float]]:
 def transpose(a: list[list[float]]) -> list[list[float]]:
     """Gibt die transponierte Matrix a zurück."""
     return [