diff --git a/blog/2019-04-05-on-captive-portals.markdown b/blog/2019-04-05-on-captive-portals.markdown
index 25327a1..bb50fa5 100644
--- a/blog/2019-04-05-on-captive-portals.markdown
+++ b/blog/2019-04-05-on-captive-portals.markdown
@@ -48,4 +48,4 @@ So yeah, I think captive portals are BAD.
 
 [^1]: There are one that hijacks DNS, but usually devices have DNSs cached, so that seems to be not popular.
 [^2]: This could also be because firefox is caching `301` redirects it has seen before.
-[^3]: I run a similiar URL at `nossl.dbalan.in`, but you should trust mozilla one than my tiny server.
+[^3]: I run a similiar URL at <http://nossl.dbalan.in>, but you should trust mozilla one than my tiny server.