diff --git a/www/common/outer/async-store.js b/www/common/outer/async-store.js
index 8a786aeec..2b6663ef2 100644
--- a/www/common/outer/async-store.js
+++ b/www/common/outer/async-store.js
@@ -1055,6 +1055,8 @@ define([
                 },
                 onConnectionChange: function () {},
                 crypto: {
+                    // The encryption and decryption is done in the outer window.
+                    // This async-store only deals with already encrypted messages.
                     encrypt: function (m) { return m; },
                     decrypt: function (m) { return m; }
                 },