diff --git a/glib/gtestutils.c b/glib/gtestutils.c
index 1a63bfe42..fcf1caff3 100644
--- a/glib/gtestutils.c
+++ b/glib/gtestutils.c
@@ -3858,8 +3858,9 @@ wait_for_child (GPid pid,
  * Since: 2.16
  *
  * Deprecated: This function is implemented only on Unix platforms,
- * and is not always reliable due to problems inherent in
- * fork-without-exec. Use g_test_trap_subprocess() instead.
+ * is not always reliable due to problems inherent in fork-without-exec
+ * and doesn't set close-on-exec flag on its file descriptors.
+ * Use g_test_trap_subprocess() instead.
  */
 G_GNUC_BEGIN_IGNORE_DEPRECATIONS
 gboolean