diff --git a/lib/mixins/property-effects.html b/lib/mixins/property-effects.html
index f87afc3f23..93c7bf4ed8 100644
--- a/lib/mixins/property-effects.html
+++ b/lib/mixins/property-effects.html
@@ -881,6 +881,8 @@
    * arguments are literals), and an array of `args`
    *
    * @param {string} expression The expression to parse
+   * @param {Object} hostProps A map of host properties that need accessors;
+   *   any parsed arguments or method name will be added to this map.
    * @return {?Object} The method metadata object if a method expression was
    *   found, otherwise `undefined`
    * @private