diff --git a/lib/cli/cli.js b/lib/cli/cli.js
index 9d49d3ab3..2b872dac7 100644
--- a/lib/cli/cli.js
+++ b/lib/cli/cli.js
@@ -715,6 +715,12 @@ module.exports.parseCommandLine = function parseCommandLine() {
       default: true,
       group: 'Chrome'
     })
+    .option('browsertime.chrome.appendToUserAgent', {
+      alias: 'chrome.appendToUserAgent',
+      type: 'string',
+      describe: 'Append to the user agent.',
+      group: 'Chrome'
+    })
     .option('browsertime.chrome.android.package', {
       alias: 'chrome.android.package',
       describe: