diff --git a/Haskell.gitignore b/Haskell.gitignore
index a4ee41ab..450f32ec 100644
--- a/Haskell.gitignore
+++ b/Haskell.gitignore
@@ -17,3 +17,4 @@ cabal.sandbox.config
 *.eventlog
 .stack-work/
 cabal.project.local
+.HTF/