diff --git a/lib/plugin.js b/lib/plugin.js
index 84a082b..64fff75 100644
--- a/lib/plugin.js
+++ b/lib/plugin.js
@@ -279,6 +279,8 @@ exports.init = function initDB(peer, config) {
     return null
   }
 
+  // TODO: improve performance of this when getting many messages, the argument
+  // could be an array of hashes, so we can do a single pass over the records.
   function getRecord(msgId) {
     const isUri = msgId.startsWith('ppppp:')
     for (let i = 0; i < recs.length; i++) {
@@ -352,7 +354,7 @@ exports.init = function initDB(peer, config) {
     // internal
     findEncryptionFormatFor,
 
-    // mockable by tests
+    // used by tests
     _getLog: () => log,
   }
 }