diff --git a/openap/fuel.py b/openap/fuel.py
index 6e83072..e770396 100644
--- a/openap/fuel.py
+++ b/openap/fuel.py
@@ -46,6 +46,8 @@ def __init__(self, ac, eng=None, **kwargs):
         if not hasattr(self, "WRAP"):
             self.WRAP = importlib.import_module("openap.kinematic").WRAP
 
+        self.use_synonym = kwargs.get("use_synonym", False)
+
         self.ac = ac.lower()
         self.aircraft = prop.aircraft(ac, **kwargs)
 
@@ -65,7 +67,7 @@ def fuel_params(self):
         """Obtain the fuel model parameters.
 
         Returns:
-            dict: drag polar model parameters.
+            dict: fuel model parameters.
         """
         polar_files = glob.glob(dir_fuelmodel + "*.yml")
         ac_polar_available = [pathlib.Path(s).stem for s in polar_files]
@@ -77,7 +79,7 @@ def fuel_params(self):
             if self.use_synonym and syno.shape[0] > 0:
                 ac = syno.new.iloc[0]
             else:
-                raise ValueError(f"Drag polar for {self.ac} not avaiable.")
+                raise ValueError(f"Fuel model for {self.ac} not avaiable.")
 
         f = dir_fuelmodel + ac + ".yml"
         with open(f, "r") as file: