diff --git a/lib/services/db.js b/lib/services/db.js
index 55c209c4..3161f43d 100644
--- a/lib/services/db.js
+++ b/lib/services/db.js
@@ -126,5 +126,16 @@ module.exports.getLatestData = getLatestData;
 module.exports.pipeToPromise = pipeToPromise;
 module.exports.registerStorage = registerStorage;
 
+// methods from storage module, assigned in registerStorage
+module.exports.put;
+module.exports.get;
+module.exports.del;
+module.exports.batch;
+module.exports.putMeta;
+module.exports.patchMeta;
+module.exports.getMeta;
+module.exports.raw;
+module.exports.createReadStream;
+
 // For testing
 module.exports.defer = defer;