diff --git a/migrations/007.date-details.down.sql b/migrations/007.date-details.down.sql
new file mode 100644
index 00000000..3edaec9d
--- /dev/null
+++ b/migrations/007.date-details.down.sql
@@ -0,0 +1,4 @@
+-- Remove source details and links
+
+ALTER TABLE buildings DROP COLUMN IF EXISTS date_source_detail;
+ALTER TABLE buildings DROP COLUMN IF EXISTS date_link;
diff --git a/migrations/007.date-details.up.sql b/migrations/007.date-details.up.sql
new file mode 100644
index 00000000..3d2c698f
--- /dev/null
+++ b/migrations/007.date-details.up.sql
@@ -0,0 +1,10 @@
+--
+-- Source details and links
+--
+
+-- Create date source details
+ALTER TABLE buildings ADD COLUMN IF NOT EXISTS date_source_detail varchar;
+ALTER TABLE buildings ADD CONSTRAINT buildings_date_source_detail_len CHECK (length(date_source_detail) < 500);
+
+-- Create list of links
+ALTER TABLE buildings ADD COLUMN IF NOT EXISTS date_link text[];