diff --git a/js/util/ExponentialReExpressClosure.js b/js/util/ExponentialReExpressClosure.js
index 1057f60..3b0fd85 100644
--- a/js/util/ExponentialReExpressClosure.js
+++ b/js/util/ExponentialReExpressClosure.js
@@ -4,13 +4,14 @@
  * This is the closure class for use in expressInterest to re express with exponential falloff.
  */
 
-/*
+/**
  * Create a new ExponentialReExpressClosure where upcall responds to UPCALL_INTEREST_TIMED_OUT
  *   by expressing the interest again with double the interestLifetime. If the interesLifetime goes
  *   over maxInterestLifetime, then call callerClosure.upcall with UPCALL_INTEREST_TIMED_OUT.
  * When upcall is not UPCALL_INTEREST_TIMED_OUT, just call callerClosure.upcall.
- * 
- * settings is an associative array with the following defaults:
+ * @constructor
+ * @param {Closure} callerClosure
+ * @param {Object} settings if not null, an associative array with the following defaults:
  * {
  *   maxInterestLifetime: 16000 // milliseconds
  * }
@@ -25,6 +26,10 @@
 	this.maxInterestLifetime = (settings.maxInterestLifetime || 16000);
 };
 
+/**
+ * Wrap this.callerClosure to responds to UPCALL_INTEREST_TIMED_OUT
+ *   by expressing the interest again as described in the constructor.
+ */
 ExponentialReExpressClosure.prototype.upcall = function(kind, upcallInfo) {
     try {
         if (kind == Closure.UPCALL_INTEREST_TIMED_OUT) {