diff --git a/numethods/orthogonal.py b/numethods/orthogonal.py
index 14efcbc..324d70c 100644
--- a/numethods/orthogonal.py
+++ b/numethods/orthogonal.py
@@ -123,6 +123,6 @@ class LeastSquaresSolver:
         ]
         # Take only first n entries
         Qtb = Vector(Qtb_full[: self.A.n])
-        # Extract leading n×n block of R
+        # Extract leading nxn block of R
         Rtop = Matrix([R.data[i][: self.A.n] for i in range(self.A.n)])
         return backward_substitution(Rtop, Qtb)