diff --git a/include/Sphere.h b/include/Sphere.h
index f7d4f09..a94a1c6 100644
--- a/include/Sphere.h
+++ b/include/Sphere.h
@@ -41,7 +41,7 @@ public:
   //! Get the relative position of the given point to the sphere as a 3D vector.
   Vector3D* getRelativePosition( Vector3D *position );
 
-  //! Set the velcoity of the sphere as a 3D vector.
+  //! Set the velocity of the sphere as a 3D vector.
   StkFloat getVelocity( Vector3D* velocity );
 
   //! Returns the distance from the sphere boundary to the given position (< 0 if inside).