diff --git a/db/newsgroup.sql b/db/newsgroup.sql
index 29023d0..e26e277 100644
--- a/db/newsgroup.sql
+++ b/db/newsgroup.sql
@@ -19,6 +19,10 @@ create table message (
     content       TEXT NOT NULL
 );
 
+create index message_created_on_idx on message (
+    created_on
+);
+
 create table newsgroup_message (
     newsgroup_id INTEGER NOT NULL,
     message_id INTEGER NOT NULL,