diff --git a/lib/doctest.js b/lib/doctest.js
index 0b221a6c..6f0a7da8 100644
--- a/lib/doctest.js
+++ b/lib/doctest.js
@@ -280,11 +280,13 @@ function processLine(
 //  .   '!': false,
 //  .   input: {
 //  .     value: '6 * 7',
-//  .     loc: {start: {line: 1, column: 0}, end: {line: 1, column: 10}}},
+//  .     loc: {start: {line: 1, column: 0}, end: {line: 1, column: 10}}
+//  .   },
 //  .   output: [{
 //  .     channel: null,
 //  .     value: '42',
-//  .     loc: {start: {line: 2, column: 0}, end: {line: 2, column: 5}}}]
+//  .     loc: {start: {line: 2, column: 0}, end: {line: 2, column: 5}}
+//  .   }]
 //  . }]
 function transformComments(options, comments) {
   var result = comments.reduce (function(accum, comment, commentIndex) {