diff --git a/src/CliProgram/CommandCall/CommandArgumentList.php b/src/CliProgram/CommandCall/CommandArgumentList.php
index 59e071c..e980863 100644
--- a/src/CliProgram/CommandCall/CommandArgumentList.php
+++ b/src/CliProgram/CommandCall/CommandArgumentList.php
@@ -60,7 +60,7 @@ class CommandArgumentList {
      *
      * @return $this
      */
-    public function addOption (string $name, mixed $value): static {
+    public function addOption (string $name, mixed $value = true): static {
         $this->arguments[(str_starts_with($name, '-') ? '' : '--') . $name] = $value;
         return $this;
     }