goption: g_option_context_new allows NULL for parameter_string

diff --git a/glib/goption.c b/glib/goption.c
index c38c163..e33f992 100644 (file)
--- a/glib/goption.c
+++ b/glib/goption.c
@@ -276,7 +276,7 @@ G_DEFINE_QUARK (g-option-context-error-quark, g_option_error)
 
 /**
  * g_option_context_new:
- * @parameter_string: a string which is displayed in
+ * @parameter_string: (allow-none): a string which is displayed in
  *    the first line of <option>--help</option> output, after the
  *    usage summary
  *    <literal><replaceable>programname</replaceable> [OPTION...]</literal>