diff --git a/src/Chapter2.hs b/src/Chapter2.hs
index f969a34b..f7c02ce2 100644
--- a/src/Chapter2.hs
+++ b/src/Chapter2.hs
@@ -72,7 +72,7 @@ type) definition.
 
 When working with lists, the most practical module will be "Data.List":
 
-   * http://hackage.haskell.org/package/base-4.14.0.0/docs/Data-List.html
+   * https://hackage.haskell.org/package/base-4.14.0.0/docs/Data-List.html
 -}