diff --git a/changelog.d/180.added.md b/changelog.d/180.added.md
new file mode 100644
index 00000000..c798eaaa
--- /dev/null
+++ b/changelog.d/180.added.md
@@ -0,0 +1 @@
+Added  to be set by  decorator
\ No newline at end of file
diff --git a/demo.gds b/demo.gds
new file mode 100644
index 00000000..85006bad
Binary files /dev/null and b/demo.gds differ
diff --git a/docs/mkdocs.yml b/docs/mkdocs.yml
index 481bba71..a535c2cd 100644
--- a/docs/mkdocs.yml
+++ b/docs/mkdocs.yml
@@ -7,6 +7,7 @@ nav:
   - Home:
     - Intro: index.md
     - gdsfactory.md
+    - dosdonts.md
   - First Steps:
     - Prerequisites: pre.md
     - 5min Intro to KFactory: intro.md
diff --git a/docs/source/dosdonts.md b/docs/source/dosdonts.md
new file mode 100644
index 00000000..e19989ff
--- /dev/null
+++ b/docs/source/dosdonts.md
@@ -0,0 +1,9 @@
+# Dos and Don'ts
+
+
+## Dos
+
+## Don'ts
+
+* Do not use "function_name" as a function parameter when using `@kf.cell` decorator,
+  it will be overwritten by the function name used to create the cell
diff --git a/src/kfactory/kcell.py b/src/kfactory/kcell.py
index 1e08542a..fedf380d 100644
--- a/src/kfactory/kcell.py
+++ b/src/kfactory/kcell.py
@@ -3520,6 +3520,8 @@ def wrapped_cell(
                 if set_settings:
                     settings = cell.settings.model_dump()
                     settings.update(params)
+                    if set_name:
+                        settings["function_name"] = name
                     cell._settings = KCellSettings(**settings)
                 info = cell.info.model_dump()
                 for name, value in cell.info: