diff --git a/README.md b/README.md
index 24b0ff2..11fdf59 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,7 @@ This Package contains a few fundamental function which can be used for **matrice
 - matmul function
 - transpose function
 - rot_2D function
+- rot_3D function
 
 ## matmul function:
 
@@ -89,4 +90,25 @@ rotation matrix for 90°:
 6.12323e-17  -1
 1             6.12323e-17
 -----------  ------------
+```
+
+## rot_3D function:
+This function calculates the rotation matrix for one 3D axis (x, y, z) for a certain angle.
+
+**Example:**
+```
+theta = math.pi / 2
+R = rot_3D(theta, "y")
+
+print("rotation matrix for 90° on the y axis:")
+print(tabulate(R))
+```
+**Result:**
+```
+rotation matrix for 90° on the y axis:
+------------  -  -----------
+ 6.12323e-17  0  1
+ 0            1  0
+-1            0  6.12323e-17
+------------  -  -----------
 ```
\ No newline at end of file
diff --git a/matrixmania/__init__.py b/matrixmania/__init__.py
index 2dbdec6..e3601ab 100644
--- a/matrixmania/__init__.py
+++ b/matrixmania/__init__.py
@@ -1 +1 @@
-from .compute import matmul, transpose, rot_2D
+from .compute import matmul, transpose, rot_2D, rot_3D
diff --git a/matrixmania/compute.py b/matrixmania/compute.py
index eb0d0c7..5f285d4 100644
--- a/matrixmania/compute.py
+++ b/matrixmania/compute.py
@@ -127,3 +127,9 @@ if __name__ == "__main__":
     print("Matrix A:")
     print(tabulate(matrix_a))
 
+    theta = math.pi / 2
+    R = rot_3D(theta, "y")
+
+    print("rotation matrix for 90° on the y axis:")
+    print(tabulate(R))
+
diff --git a/pyproject.toml b/pyproject.toml
index 52c7d87..43e03b6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "matrixmania_benkertmo99686"
-version = "0.1.0"
+version = "0.2.0"
 description = "MatrixMania: Simple linear algebra functions for teaching (matmul, transpose, rot_2D)."
 authors = [
  { name="Mona Benkert", email="benkertmo99686@th-nuernberg.de" }