diff --git a/__tests__/lib/module_filters.js b/__tests__/lib/module_filters.js
new file mode 100644
index 000000000..82309cf08
--- /dev/null
+++ b/__tests__/lib/module_filters.js
@@ -0,0 +1,13 @@
+var moduleFilters = require('../../src/module_filters');
+
+test('moduleFilters.internalOnly', function() {
+  expect(moduleFilters.internalOnly('./foo')).toEqual(true);
+  expect(moduleFilters.internalOnly('foo')).toEqual(false);
+});
+
+test('moduleFilters.externals', function() {
+  expect(moduleFilters.externals([], {})('./foo')).toEqual(true);
+  expect(
+    moduleFilters.externals([], { external: 'node_modules' })('./foo')
+  ).toEqual(true);
+});
diff --git a/src/module_filters.js b/src/module_filters.js
index ab30d06b7..bf5bd796b 100644
--- a/src/module_filters.js
+++ b/src/module_filters.js
@@ -23,7 +23,7 @@ module.exports = {
    * @param {Array<string>} indexes - the list of entry points that will be
    * used by module-deps
    * @param {Object} options - An options object with `external` being a
-   * micromatch-compaitible glob. *NOTE:* the glob will be matched relative to
+   * micromatch-compatible glob. *NOTE:* the glob will be matched relative to
    * the top-level node_modules directory for each entry point.
    * @returns {function} - A function for use as the module-deps `postFilter`
    * options.