diff --git a/migrations/000069_add_unique_index_package_symbols.down.sql b/migrations/000069_add_unique_index_package_symbols.down.sql
new file mode 100644
index 00000000..04132892
--- /dev/null
+++ b/migrations/000069_add_unique_index_package_symbols.down.sql
@@ -0,0 +1,9 @@
+-- Copyright 2021 The Go Authors. All rights reserved.
+-- Use of this source code is governed by a BSD-style
+-- license that can be found in the LICENSE file.
+
+BEGIN;
+
+DROP INDEX package_symbols_package_path_id_module_path_id_section_synopsis_key;
+
+END;
diff --git a/migrations/000069_add_unique_index_package_symbols.up.sql b/migrations/000069_add_unique_index_package_symbols.up.sql
new file mode 100644
index 00000000..6a06ff87
--- /dev/null
+++ b/migrations/000069_add_unique_index_package_symbols.up.sql
@@ -0,0 +1,10 @@
+-- Copyright 2021 The Go Authors. All rights reserved.
+-- Use of this source code is governed by a BSD-style
+-- license that can be found in the LICENSE file.
+
+BEGIN;
+
+CREATE UNIQUE INDEX package_symbols_package_path_id_module_path_id_section_synopsis_key
+    ON package_symbols(package_path_id, module_path_id, section, synopsis);
+
+END;