diff --git a/crypto/bn256/cloudflare/bn256.go b/crypto/bn256/cloudflare/bn256.go
index 4f607af2ad..07500fabf7 100644
--- a/crypto/bn256/cloudflare/bn256.go
+++ b/crypto/bn256/cloudflare/bn256.go
@@ -9,7 +9,7 @@
 //
 // This package specifically implements the Optimal Ate pairing over a 256-bit
 // Barreto-Naehrig curve as described in
-// http://cryptojedi.org/papers/dclxvi-20100714.pdf. Its output is not
+// <https://cryptojedi.org/papers/dclxvi-20100714.pdf>. Its output is not
 // compatible with the implementation described in that paper, as different
 // parameters are chosen.
 //