diff --git a/docs/database/updates/2019-03-04.sql b/docs/database/updates/2019-03-04.sql
new file mode 100644
index 0000000000..b30242ff49
--- /dev/null
+++ b/docs/database/updates/2019-03-04.sql
@@ -0,0 +1 @@
+CREATE INDEX dedup_idx on sentences (text, lang);