diff --git a/lib/models/event.js b/lib/models/event.js
index 7f4e91259..7f9afce00 100644
--- a/lib/models/event.js
+++ b/lib/models/event.js
@@ -248,8 +248,8 @@ module.exports.MatrixEvent.prototype = {
      * The keys that must have been owned by the sender of this encrypted event.
      * These don't necessarily have to come from this event itself, but may be
      * implied by the cryptographic session.
-     * For example megolm messages don't claim keys directly, but instead
-     * inherit a claim from the olm message that established the session.
+     * For example megolm messages don't prove keys directly, but instead
+     * inherit a proof from the olm message that established the session.
      * @return {object}
      */
     getKeysProved: function() {