diff --git a/synapse/storage/schema/delta/v11.sql b/synapse/storage/schema/delta/v11.sql
new file mode 100644
index 0000000000..313592221b
--- /dev/null
+++ b/synapse/storage/schema/delta/v11.sql
@@ -0,0 +1,16 @@
+/* Copyright 2015 OpenMarket Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+CREATE INDEX IF NOT EXISTS sent_transaction_txn_id ON sent_transactions(transaction_id);
\ No newline at end of file
diff --git a/synapse/storage/schema/delta/v2.sql b/synapse/storage/schema/delta/v2.sql
index 73b140465e..f740f6dd5d 100644
--- a/synapse/storage/schema/delta/v2.sql
+++ b/synapse/storage/schema/delta/v2.sql
@@ -1,4 +1,4 @@
-/* Copyright 2014 OpenMarket Ltd
+/* Copyright 2014, 2015 OpenMarket Ltd
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
diff --git a/synapse/storage/schema/delta/v3.sql b/synapse/storage/schema/delta/v3.sql
index cade295989..c67e38ff52 100644
--- a/synapse/storage/schema/delta/v3.sql
+++ b/synapse/storage/schema/delta/v3.sql
@@ -1,4 +1,4 @@
-/* Copyright 2014 OpenMarket Ltd
+/* Copyright 2014, 2015 OpenMarket Ltd
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
diff --git a/synapse/storage/schema/delta/v4.sql b/synapse/storage/schema/delta/v4.sql
index 25d2ead450..d3807b7686 100644
--- a/synapse/storage/schema/delta/v4.sql
+++ b/synapse/storage/schema/delta/v4.sql
@@ -1,3 +1,17 @@
+/* Copyright 2014, 2015 OpenMarket Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
CREATE TABLE IF NOT EXISTS redactions (
event_id TEXT NOT NULL,
redacts TEXT NOT NULL,
diff --git a/synapse/storage/schema/delta/v5.sql b/synapse/storage/schema/delta/v5.sql
index af9df11aa9..0874a15431 100644
--- a/synapse/storage/schema/delta/v5.sql
+++ b/synapse/storage/schema/delta/v5.sql
@@ -1,3 +1,17 @@
+/* Copyright 2014, 2015 OpenMarket Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
CREATE TABLE IF NOT EXISTS user_ips (
user TEXT NOT NULL,
diff --git a/synapse/storage/schema/delta/v6.sql b/synapse/storage/schema/delta/v6.sql
index 9bf2068d84..a9e0a4fe0d 100644
--- a/synapse/storage/schema/delta/v6.sql
+++ b/synapse/storage/schema/delta/v6.sql
@@ -1,4 +1,4 @@
-/* Copyright 2014 OpenMarket Ltd
+/* Copyright 2014, 2015 OpenMarket Ltd
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
diff --git a/synapse/storage/schema/delta/v8.sql b/synapse/storage/schema/delta/v8.sql
index daf6646ed5..1e9f8b18cb 100644
--- a/synapse/storage/schema/delta/v8.sql
+++ b/synapse/storage/schema/delta/v8.sql
@@ -1,4 +1,4 @@
-/* Copyright 2014 OpenMarket Ltd
+/* Copyright 2014, 2015 OpenMarket Ltd
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
diff --git a/synapse/storage/schema/delta/v9.sql b/synapse/storage/schema/delta/v9.sql
index 0af29733a0..455d51a70c 100644
--- a/synapse/storage/schema/delta/v9.sql
+++ b/synapse/storage/schema/delta/v9.sql
@@ -1,4 +1,4 @@
-/* Copyright 2014 OpenMarket Ltd
+/* Copyright 2014, 2015 OpenMarket Ltd
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
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