diff --git a/src/unionfind.rs b/src/unionfind.rs
index 3ded335..6521468 100644
--- a/src/unionfind.rs
+++ b/src/unionfind.rs
@@ -5,7 +5,7 @@
 /// `UnionFind<K>` is a disjoint-set data structure. It tracks set membership of *n* elements
 /// indexed from *0* to *n - 1*. The scalar type is `K` which must be an unsigned integer type.
 ///
-/// http://en.wikipedia.org/wiki/Disjoint-set_data_structure
+/// <http://en.wikipedia.org/wiki/Disjoint-set_data_structure>
 ///
 /// Too awesome not to quote:
 ///