diff --git a/tools/doc/generate.js b/tools/doc/generate.js
index 94c0905468f862..7df987e1cf78f9 100644
--- a/tools/doc/generate.js
+++ b/tools/doc/generate.js
@@ -24,6 +24,8 @@ args.forEach(function(arg) {
   }
 });
 
+nodeVersion = nodeVersion || process.version;
+
 if (!inputFile) {
   throw new Error('No input file specified');
 }
@@ -46,15 +48,11 @@ function next(er, input) {
       break;
 
     case 'html':
-      require('./html.js')({
-        input: input,
-        filename: inputFile,
-        template: template,
-        nodeVersion: nodeVersion,
-      }, function(er, html) {
-        if (er) throw er;
-        console.log(html);
-      });
+      require('./html.js')(input, inputFile, template, nodeVersion,
+        function(er, html) {
+          if (er) throw er;
+          console.log(html);
+        });
       break;
 
     default:
diff --git a/tools/doc/html.js b/tools/doc/html.js
index 45d0a809143a8f..ef7d78d5b70ab3 100644
--- a/tools/doc/html.js
+++ b/tools/doc/html.js
@@ -30,11 +30,12 @@ var gtocPath = path.resolve(path.join(
 var gtocLoading = null;
 var gtocData = null;
 
-/**
- * opts: input, filename, template, nodeVersion.
- */
-function toHTML(opts, cb) {
-  var template = opts.template;
+function toHTML(input, filename, template, nodeVersion, cb) {
+  if (typeof nodeVersion === 'function') {
+    cb = nodeVersion;
+    nodeVersion = null;
+  }
+  nodeVersion = nodeVersion || process.version;
 
   if (gtocData) {
     return onGtocLoaded();
@@ -56,15 +57,10 @@ function toHTML(opts, cb) {
   }
 
   function onGtocLoaded() {
-    var lexed = marked.lexer(opts.input);
+    var lexed = marked.lexer(input);
     fs.readFile(template, 'utf8', function(er, template) {
       if (er) return cb(er);
-      render({
-        lexed: lexed,
-        filename: opts.filename,
-        template: template,
-        nodeVersion: opts.nodeVersion,
-      }, cb);
+      render(lexed, filename, template, nodeVersion, cb);
     });
   }
 }
@@ -91,13 +87,13 @@ function toID(filename) {
     .replace(/-+/g, '-');
 }
 
-/**
- * opts: lexed, filename, template, nodeVersion.
- */
-function render(opts, cb) {
-  var lexed = opts.lexed;
-  var filename = opts.filename;
-  var template = opts.template;
+function render(lexed, filename, template, nodeVersion, cb) {
+  if (typeof nodeVersion === 'function') {
+    cb = nodeVersion;
+    nodeVersion = null;
+  }
+
+  nodeVersion = nodeVersion || process.version;
 
   // get the section
   var section = getSection(lexed);
@@ -117,7 +113,7 @@ function render(opts, cb) {
     template = template.replace(/__ID__/g, id);
     template = template.replace(/__FILENAME__/g, filename);
     template = template.replace(/__SECTION__/g, section);
-    template = template.replace(/__VERSION__/g, opts.nodeVersion);
+    template = template.replace(/__VERSION__/g, nodeVersion);
     template = template.replace(/__TOC__/g, toc);
     template = template.replace(
       /__GTOC__/g,