diff --git a/README.md b/README.md
index de62a47..828596f 100644
--- a/README.md
+++ b/README.md
@@ -26,6 +26,8 @@ https://www.schoolofhaskell.com/user/griba/easier_lenses_profunctor_based_with_m
 
 https://www.schoolofhaskell.com/user/liyang/profunctors
 
+https://twanvl.nl/blog/haskell/isomorphism-lenses
+
 https://blog.jez.io/lens-intuition/
 
 https://blog.jle.im/entry/lenses-products-prisms-sums.html