diff --git a/index.js b/index.js
index a3a8f6f..38a534a 100644
--- a/index.js
+++ b/index.js
@@ -13,11 +13,26 @@ var externalModuleRegexp = process.platform === 'win32' ?
   /^(\.|\w:)/ :
   /^[\/.]/;
 
+/**
+ * Detect whether a comment is a JSDoc comment: it should start with
+ * two asterisks, not any other number of asterisks.
+ *
+ * The code parser automatically strips out the first asterisk that's
+ * required for the comment to be a comment at all, so we count the remaining
+ * comments.
+ * @param {String} comment
+ * @return {boolean} whether it is valid
+ */
+function isJSDocComment(code) {
+  var asterisks = code.match(/^(\*+)/);
+  return asterisks && asterisks[ 1 ].length === 1;
+}
+
 /**
  * Comment-out a shebang line that may sit at the top of a file,
  * making it executable on linux-like systems.
  * @param {String} code
- * @return code
+ * @return {String} code
  */
 function commentShebang(code) {
   return (code[ 0 ] === '#' && code[ 1 ] === '!') ? '//' + code : code;
@@ -58,7 +73,9 @@ module.exports = function (index) {
           node.leadingComments.filter(function (c) {
             return c.type === 'Block';
           }).map(function (comment) {
-            docs.push(doctrine.parse(comment.value, { unwrap: true }));
+            if (isJSDocComment(comment.value)) {
+              docs.push(doctrine.parse(comment.value, { unwrap: true }));
+            }
           });
         }
         this.traverse(path);
diff --git a/test/fixture/simple-singlestar.js b/test/fixture/simple-singlestar.js
new file mode 100644
index 0000000..dc8a030
--- /dev/null
+++ b/test/fixture/simple-singlestar.js
@@ -0,0 +1,8 @@
+/*
+ * This function returns the number one.
+ * @return {Number} numberone
+ */
+module.exports = function () {
+  // this returns 1
+  return 1;
+};
diff --git a/test/fixture/simple-triplestar.js b/test/fixture/simple-triplestar.js
new file mode 100644
index 0000000..bf22216
--- /dev/null
+++ b/test/fixture/simple-triplestar.js
@@ -0,0 +1,8 @@
+/***
+ * This function returns the number one.
+ * @return {Number} numberone
+ */
+module.exports = function () {
+  // this returns 1
+  return 1;
+};
diff --git a/test/test.js b/test/test.js
index 41db6e1..6258843 100644
--- a/test/test.js
+++ b/test/test.js
@@ -13,6 +13,20 @@ test('documentation', function (t) {
   }));
 });
 
+test('documentation - single star', function (t) {
+  documentation(path.join(__dirname, 'fixture/simple-singlestar.js')).pipe(concat(function (data) {
+    t.equal(data.length, 0, 'simple has no dependencies');
+    t.end();
+  }));
+});
+
+test('documentation - triple star', function (t) {
+  documentation(path.join(__dirname, 'fixture/simple-triplestar.js')).pipe(concat(function (data) {
+    t.equal(data.length, 0, 'simple has no dependencies');
+    t.end();
+  }));
+});
+
 test('documentation - hashbang', function (t) {
   documentation(path.join(__dirname, 'fixture/simple-hashbang.js')).pipe(concat(function (data) {
     t.equal(data.length, 1, 'simple has no dependencies');