diff --git a/haskell-style.md b/haskell-style.md
index 2bc37b0..e26077d 100644
--- a/haskell-style.md
+++ b/haskell-style.md
@@ -240,6 +240,7 @@ Sort your exports, unless the order matters in your desired Haddock output.
   language: GHC2021
 
   default-extensions:
+    - ApplicativeDo
     - DataKinds
     - DeriveAnyClass
     - DerivingStrategies