diff --git a/changelog.d/added/comment-cabal.md b/changelog.d/added/comment-cabal.md
new file mode 100644
index 000000000..cafa9a79b
--- /dev/null
+++ b/changelog.d/added/comment-cabal.md
@@ -0,0 +1,2 @@
+- Added `.cabal` and `cabal.project` (Haskell) as recognised file types for
+  comments. (#1089)
diff --git a/src/reuse/comment.py b/src/reuse/comment.py
index 9d4872657..5b0ca08f3 100644
--- a/src/reuse/comment.py
+++ b/src/reuse/comment.py
@@ -608,6 +608,7 @@ class XQueryCommentStyle(CommentStyle):
     ".bib": BibTexCommentStyle,
     ".bzl": PythonCommentStyle,
     ".c": CCommentStyle,
+    ".cabal": HaskellCommentStyle,
     ".cc": CppCommentStyle,
     ".cjs": CppCommentStyle,
     ".cl": LispCommentStyle,
@@ -878,6 +879,7 @@ class XQueryCommentStyle(CommentStyle):
     ".yarnrc": PythonCommentStyle,
     "ansible.cfg": PythonCommentStyle,
     "archive.sctxar": UncommentableCommentStyle,  # SuperCollider global archive
+    "cabal.project": HaskellCommentStyle,
     "Cargo.lock": PythonCommentStyle,
     "CMakeLists.txt": PythonCommentStyle,
     "CODEOWNERS": PythonCommentStyle,