diff --git a/src/bcf/bcf/v2/topic.py b/src/bcf/bcf/v2/topic.py
index d5955c5aa0..de68cb5dd7 100644
--- a/src/bcf/bcf/v2/topic.py
+++ b/src/bcf/bcf/v2/topic.py
@@ -68,6 +68,11 @@ class TopicHandler:
         """Return the comments of the topic."""
         return self.markup.comment if self.markup else []
 
+    @comments.setter
+    def comments(self, comments: list[mdl.Comment]) -> None:
+        assert self.markup
+        self.markup.comment = comments
+
     @property
     def bim_snippet(self) -> Optional[bytes]:
         if not self._bim_snippet and self._topic_dir:
diff --git a/src/bcf/bcf/v3/topic.py b/src/bcf/bcf/v3/topic.py
index b2f2bf4e22..34a9af35fa 100644
--- a/src/bcf/bcf/v3/topic.py
+++ b/src/bcf/bcf/v3/topic.py
@@ -65,6 +65,15 @@ class TopicHandler:
         """Return the comments of the topic."""
         return self.topic.comments.comment if self.topic.comments else []
 
+    @comments.setter
+    def comments(self, comments: list[mdl.Comment]) -> None:
+        topic_comments = self.topic.comments
+        if topic_comments is None:
+            if not comments:
+                return
+            self.topic.comments = (topic_comments := mdl.TopicComments())
+        topic_comments.comment = comments
+
     @property
     def bim_snippet(self) -> Optional[bytes]:
         if not self._bim_snippet and self._topic_dir: