diff --git a/docs/tutorials/intro.ipynb b/docs/tutorials/intro.ipynb
index f1b87422..54f29703 100644
--- a/docs/tutorials/intro.ipynb
+++ b/docs/tutorials/intro.ipynb
@@ -135,7 +135,7 @@
     "import sax\n",
     "from jax.typing import ArrayLike\n",
     "\n",
-    "def custom_model(*, param: float = 0.5) -> sax.SDict:\n",
+    "def custom_model(param: float = 0.5) -> sax.SDict:\n",
     "    \"\"\"This model will have one parameter, param, which defaults to 0.5.\n",
     "    \n",
     "    Args:\n",
@@ -164,11 +164,10 @@
     "\n",
     "* [Python 3 guide for scientists](https://python-3-for-scientists.readthedocs.io/en/latest/python3_advanced.html)\n",
     "* [Luke Plant's Blog](https://lukeplant.me.uk/blog/posts/keyword-only-arguments-in-python/)\n",
-    "* [PEP 3102: Keyword-Only Arguments](https://peps.python.org/pep-3102/)\n",
     "```\n",
     "\n",
     "```{important}\n",
-    "Model function parameters **are required to be keyword-only**. Syntactically, this means the first argument in the function definition must be `*`.\n",
+    "Model function parameters **are required to be keyword-only**.\n",
     "```\n",
     "\n",
     "* In the backend, SAX inspects the model signature and passes in only the requested variables to the model function. \n",
diff --git a/simphony/libraries/sipann.py b/simphony/libraries/sipann.py
index 48efc292..ec4fc7c8 100644
--- a/simphony/libraries/sipann.py
+++ b/simphony/libraries/sipann.py
@@ -54,7 +54,6 @@ def _create_sdict_from_model(model, wl: Union[float, ArrayLike]) -> sax.SDict:
 
 
 def gap_func_symmetric(
-    *,
     wl: Union[float, ArrayLike] = 1.55,
     width: float = 500.0,
     thickness: float = 220.0,
@@ -111,7 +110,6 @@ def gap_func_symmetric(
 
 
 def gap_func_antisymmetric(
-    *,
     wl: Union[float, ArrayLike] = 1.55,
     width: float = 500.0,
     thickness: float = 220.0,
@@ -180,7 +178,6 @@ def gap_func_antisymmetric(
 
 
 def half_ring(
-    *,
     wl: Union[float, ArrayLike] = 1.55,
     width: float = 500.0,
     thickness: float = 220.0,
@@ -233,7 +230,6 @@ def half_ring(
 
 
 def straight_coupler(
-    *,
     wl: Union[float, ArrayLike] = 1.55,
     width: float = 500.0,
     thickness: float = 220.0,
@@ -284,7 +280,6 @@ def straight_coupler(
 
 
 def standard_coupler(
-    *,
     wl: Union[float, ArrayLike] = 1.55,
     width: float = 500.0,
     thickness: float = 220.0,
@@ -344,7 +339,6 @@ def standard_coupler(
 
 
 def double_half_ring(
-    *,
     wl: Union[float, ArrayLike] = 1.55,
     width: float = 500.0,
     thickness: float = 220.0,
@@ -399,7 +393,6 @@ def double_half_ring(
 
 
 def angled_half_ring(
-    *,
     wl: Union[float, ArrayLike] = 1.55,
     width: float = 500.0,
     thickness: float = 220.0,
@@ -464,7 +457,6 @@ def angled_half_ring(
 
 
 def waveguide(
-    *,
     wl: Union[float, ArrayLike] = 1.55,
     width: float = 500.0,
     thickness: float = 220.0,
@@ -504,7 +496,6 @@ def waveguide(
 
 
 def racetrack(
-    *,
     wl: Union[float, ArrayLike] = 1.55,
     width: float = 500.0,
     thickness: float = 220.0,
@@ -563,7 +554,6 @@ def racetrack(
 
 
 def premade_coupler(
-    *,
     wl: Union[float, ArrayLike] = 1.55,
     split: int = 50,
 ) -> sax.SDict: