diff --git a/pypesto/visualize/spline_approximation.py b/pypesto/visualize/spline_approximation.py
index 8977e7d31..51ca0e434 100644
--- a/pypesto/visualize/spline_approximation.py
+++ b/pypesto/visualize/spline_approximation.py
@@ -129,7 +129,7 @@ def plot_splines_from_pypesto_result(
         )
         return None
 
-    # Get simulation and sigma.
+    # Get simulation.
     sim = [rdata[AMICI_Y] for rdata in inner_rdatas]
 
     spline_calculator = None