diff --git a/poly.py b/poly.py
index d865067..0e68762 100644
--- a/poly.py
+++ b/poly.py
@@ -186,7 +186,7 @@ def shift(self, shift: int):
     def fft(self, inv=False):
         # Fast Fourier transform, used to convert between polynomial coefficients
         # and a list of evaluations at the roots of unity
-        # See https://vitalik.ca/general/2019/05/12/fft.html
+        # See https://vitalik.eth.limo/general/2019/05/12/fft.html
         def _fft(vals, modulus, roots_of_unity):
             if len(vals) == 1:
                 return vals
@@ -345,4 +345,4 @@ def poly(self) -> Polynomial:
         for i in range(self.n):
             lagrange_poly = self.lagrange_poly(i)
             poly += lagrange_poly * self.Y[i]
-        return poly
\ No newline at end of file
+        return poly