diff --git a/conservancy/usethesource/models.py b/conservancy/usethesource/models.py
index 8de4e74ab5a9cc1b92f5ec8ca65354cb385d824a..6b070e5443674e96c11d27e581ac69f51a4affc3 100644
--- a/conservancy/usethesource/models.py
+++ b/conservancy/usethesource/models.py
@@ -41,6 +41,7 @@ class Comment(models.Model):
 
     candidate = models.ForeignKey(Candidate, on_delete=models.CASCADE)
     user = models.ForeignKey(User, on_delete=models.PROTECT)
+    attribute_to = models.CharField(max_length=50, blank=True)
     time = models.DateTimeField(default=timezone.now)
     message = models.TextField()
     email_message_id = models.CharField(max_length=255, default=gen_message_id)