diff --git a/vcg/math/matrix44.h b/vcg/math/matrix44.h
index bef6bdb7..bcff6bbb 100644
--- a/vcg/math/matrix44.h
+++ b/vcg/math/matrix44.h
@@ -125,7 +125,7 @@ public:
 template <class T> class LinearSolve: public Matrix44<T> {
 public:
   LinearSolve(const Matrix44<T> &m);
-  Point4<T> Solve(const Point4<T> &b); // solve A · x = b 
+  Point4<T> Solve(const Point4<T> &b); // solve A · x = b 
   ///If you need to solve some equation you can use this function instead of Matrix44 one for speed.
   T Determinant() const;
 protected: