diff --git a/README.md b/README.md
index 77e177f..c40b207 100644
--- a/README.md
+++ b/README.md
@@ -87,16 +87,26 @@ results.tlsServers.forEach(function (server) {
 ## API
 
 ```
-LEX.create(options)             // checks options and sets up defaults. returns object with `listen`
-                                // (it was really just done this way to appeal to what people are used to seeing)
+                                // checks options and sets up defaults. returns object with `listen`
+LEX.create(options)             // (it was really just done this way to appeal to what people are used to seeing)
 
   lex.listen(plain, tls, fn)    // actually creates the servers and causes them to listen
 
-LEX.createSniCallback(le)       // receives an instance of letsencrypt, returns an SNICallback handler for https.createServer()
+
+                                // receives an instance of letsencrypt, returns an SNICallback handler for https.createServer()
+LEX.createSniCallback(opts)     // this will call letsencrypt.renew and letsencrypt.register as appropriate
+                                // it will randomly stagger renewals such that they don't all happen at once on boot
+                                // or at any other time. registrations will be handled as per `handleRegistration`
+  opts = {
+    letsencrypt: <obj>          // letsencrypt instance
+  , memorizeFor: <1 day>        // how long to wait before checking the disk for updated certificates
+  , renewWithin: <3 days>       // the first possible moment the certificate staggering should begin
+  , failedWait:  <5 minutes>    // how long to wait before trying again if the certificate registration failed
+  }
 
 
-LEX.getChallenge(opts, hostname, key cb)  // uses `opts.webrootPath` to read from the filesystem
-
+                                // uses `opts.webrootPath` to read from the filesystem
+LEX.getChallenge(opts, hostname, key cb)  
 ```
 
 ## Options
diff --git a/lib/standalone.js b/lib/standalone.js
index 90c144b..54d0a01 100644
--- a/lib/standalone.js
+++ b/lib/standalone.js
@@ -197,6 +197,8 @@ LEX.create = LEX;
 LEX.setChallenge = challengeStore.set;
 LEX.getChallenge = challengeStore.get;
 LEX.removeChallenge = challengeStore.remove;
+LEX.createSniCallback = createSniCallback;
+
 LEX.stagingServerUrl = LE.stagingServerUrl;
 LEX.productionServerUrl = LE.productionServerUrl || LE.liveServerUrl;
 LEX.defaultServerUrl = LEX.productionServerUrl;