docs: Clarify how to unset a GFileInfo attribute

https://bugzilla.gnome.org/show_bug.cgi?id=592666

diff --git a/gio/gfileinfo.c b/gio/gfileinfo.c
index 9456afa..2ad185e 100644 (file)
--- a/gio/gfileinfo.c
+++ b/gio/gfileinfo.c
@@ -1109,7 +1109,8 @@ _g_file_info_set_attribute_by_id (GFileInfo                 *info,
  * @type: a #GFileAttributeType
  * @value_p: pointer to the value
  *
- * Sets the @attribute to contain the given value, if possible.
+ * Sets the @attribute to contain the given value, if possible. To unset the
+ * attribute, use %G_ATTRIBUTE_TYPE_INVALID for @type.
  **/
 void
 g_file_info_set_attribute (GFileInfo                 *info,