diff --git a/tracking/__init__.py b/tracking/__init__.py
index 30f1acf38fb02d40852010e1e079302af81cc5aa..46a4f9574108c9f2472419484b4643972fbc3aa6 100644
--- a/tracking/__init__.py
+++ b/tracking/__init__.py
@@ -10,7 +10,7 @@ from mbtrack2.tracking.particles import (Electron, Proton, Bunch, Beam,
 from mbtrack2.tracking.synchrotron import Synchrotron
 from mbtrack2.tracking.rf import RFCavity, CavityResonator
 from mbtrack2.tracking.parallel import Mpi
-from mbtrack2.tracking.optics import Optics, PhyisicalModel
+from mbtrack2.tracking.optics import Optics, PhysicalModel
 from mbtrack2.tracking.element import (Element, LongitudinalMap, 
                                        TransverseMap, SynchrotronRadiation,
                                        SkewQuadrupole)
diff --git a/tracking/optics.py b/tracking/optics.py
index 67fad0fc30351183337be5dfdcfc6fd0526f0796..223a70a8bd256a23af338851fd817e4d271d21b0 100644
--- a/tracking/optics.py
+++ b/tracking/optics.py
@@ -366,7 +366,7 @@ class Optics:
         return fig
 
     
-class PhyisicalModel:
+class PhysicalModel:
     """
     Store the lattice physical parameters such as apperture and resistivity.