diff --git a/object.c b/object.c
index 83a48db557..72868120a9 100644
--- a/object.c
+++ b/object.c
@@ -918,8 +918,8 @@ rb_obj_tainted(VALUE obj)
  *  You should only untaint a tainted object if your code has inspected it and
  *  determined that it is safe. To do so use #untaint
  *
- *  In $SAFE level 3, all objects are tainted and untrusted, any use of
- *  trust or taint methods will raise a SecurityError exception.
+ *  In $SAFE level 3, all newly created objects are tainted and you can't untaint
+ *  objects.
  */
 
 VALUE