diff --git a/README.md b/README.md
index 45b936b..409cca4 100644
--- a/README.md
+++ b/README.md
@@ -72,5 +72,5 @@ pip install -e .[dev,gdsfactory,prefab]
 If you've installed the `dev` dependencies, you can run the test suite with:
 
 ```bash
-pytest
-```
\ No newline at end of file
+pytest --cov=gds_fdtd tests
+```
diff --git a/examples/05_dual_polarization/05a_si_sin_escalator.py b/examples/05_dual_polarization/05a_si_sin_escalator.py
index 76d23e6..6b6d3f1 100644
--- a/examples/05_dual_polarization/05a_si_sin_escalator.py
+++ b/examples/05_dual_polarization/05a_si_sin_escalator.py
@@ -17,7 +17,7 @@
     # Define the path to the GDS file
     file_gds = os.path.join(os.path.dirname(os.path.dirname(__file__)), "devices.gds")
 
-    layout = gtd.lyprocessor.load_layout(file_gds, top_cell='sbend_dontfabme')
+    layout = gtd.lyprocessor.load_layout(file_gds, top_cell='si_sin_escalator_te1550')
 
     simulation = gtd.simprocessor.build_sim_from_tech(
         tech=technology,