diff --git a/modules/lang/haskell/config.el b/modules/lang/haskell/config.el
index 37cd31d57..c8b6a95d4 100644
--- a/modules/lang/haskell/config.el
+++ b/modules/lang/haskell/config.el
@@ -11,7 +11,8 @@
   :hook (haskell-mode . hindent-mode))
 
 (after! haskell-mode
-  (add-hook 'haskell-mode-hook 'subword-mode)
+  (add-hook 'haskell-mode-hook 'subword-mode) ;; improves text navigation with camelCase:
+  (add-hook 'haskell-mode-hook 'haskell-collapse-mode) ;; support collapsing haskell code blocks.
   (add-hook 'haskell-mode-hook #'interactive-haskell-mode)
   (set-lookup-handlers! 'haskell-mode :definition #'haskell-mode-jump-to-def-or-tag)
   (set-file-template! 'haskell-mode :trigger #'haskell-auto-insert-module-template :project t)
@@ -25,5 +26,7 @@
         :n "b" #'haskell-process-cabal-build
         :n "c" #'haskell-cabal-visit-file
         :n "p" #'hindent-reformat-buffer
-        :v "p" #'hindent-reformat-region))
+        :v "p" #'hindent-reformat-region
+        :n "h" #'haskell-hide-toggle
+        :n "H" #'haskell-hide-toggle-all))