diff --git a/epyqlib/pm/parametermodel.py b/epyqlib/pm/parametermodel.py
index e1ba2a92..ff4a03c6 100644
--- a/epyqlib/pm/parametermodel.py
+++ b/epyqlib/pm/parametermodel.py
@@ -326,6 +326,13 @@ class Group(epyqlib.treenode.TreeNode):
             ),
         ),
     )
+    comment = attr.ib(
+        default=None,
+        converter=epyqlib.attrsmodel.to_str_or_none,
+        metadata=graham.create_metadata(
+            field=marshmallow.fields.String(allow_none=True),
+        ),
+    )
     uuid = epyqlib.attrsmodel.attr_uuid()
 
     def __attrs_post_init__(self):
diff --git a/epyqlib/tests/test_attrsmodel.py b/epyqlib/tests/test_attrsmodel.py
index cb264ff0..b0732855 100644
--- a/epyqlib/tests/test_attrsmodel.py
+++ b/epyqlib/tests/test_attrsmodel.py
@@ -104,7 +104,6 @@ def merge(name, *types):
     ),
     ((Parameter, "value"),),
     merge("uuid", *types.types.values()),
-    ((Group, "comment"),),
 )