diff --git a/PhpcsChanged/Cli.php b/PhpcsChanged/Cli.php
index 6b51834..58ff5d1 100644
--- a/PhpcsChanged/Cli.php
+++ b/PhpcsChanged/Cli.php
@@ -108,6 +108,7 @@ function printHelp() {
 	printTwoColumns([
 		'--git-staged' => 'Compare the staged version to the HEAD version (this is the default).',
 		'--git-unstaged' => 'Compare the working copy version to the staged (or HEAD) version.',
+		'--git-branch <BRANCH>' => 'Compare the HEAD version to the HEAD of a different branch.',
 	], "	");
 
 	echo <<<EOF