diff --git a/src/crypto/algorithms/megolm.js b/src/crypto/algorithms/megolm.js
index e36f46783..cf31e3056 100644
--- a/src/crypto/algorithms/megolm.js
+++ b/src/crypto/algorithms/megolm.js
@@ -850,7 +850,7 @@ MegolmDecryption.prototype.onRoomKeyEvent = function(event) {
         this._retryDecryption(senderKey, sessionId);
     }).then(() => {
         if (this._crypto.backupInfo) {
-            // don't wait for it to complete
+            // don't wait for the keys to be backed up for the server
             this._crypto.backupGroupSession(
                 content.room_id, senderKey, forwardingKeyChain,
                 content.session_id, content.session_key, keysClaimed,