diff --git a/gio/gsubprocesslauncher.c b/gio/gsubprocesslauncher.c
index 96f8454fe..3b1530053 100644
--- a/gio/gsubprocesslauncher.c
+++ b/gio/gsubprocesslauncher.c
@@ -714,7 +714,7 @@ g_subprocess_launcher_spawn (GSubprocessLauncher  *launcher,
 /**
  * g_subprocess_launcher_spawnv:
  * @self: a #GSubprocessLauncher
- * @argv: Command line arguments
+ * @argv: (array zero-terminated=1) (element-type utf8): Command line arguments
  * @error: Error
  *
  * A convenience helper for creating a #GSubprocess given a provided