diff --git a/text/0580-destroyables.md b/text/0580-destroyables.md
index 24568d98b1..1414ca8089 100644
--- a/text/0580-destroyables.md
+++ b/text/0580-destroyables.md
@@ -145,7 +145,7 @@ class CustomSelect extends Component {
 Returns the associated child for convenience.
 
 - Attempting to associate a parent or child that has already been destroyed
-  should throw an error.
+  or is being destroyed should throw an error.
 
 ##### Multiple Inheritance
 
@@ -214,7 +214,7 @@ class Modal extends Component {
 }
 ```
 
-- Registering a destructor on a destroyed object should throw an error.
+- Registering a destructor on a destroyed object or object that is being destroyed should throw an error.
 - Attempting to register the same destructor multiple times should throw an
   error.
 
@@ -287,10 +287,12 @@ destroying. Otherwise returns false.
 
 ```js
 let obj = {};
-
 isDestroying(obj); // false
 destroy(obj);
 isDestroying(obj); // true
+// ...sometime later, after scheduled destruction
+isDestroyed(obj); // true
+isDestroying(obj); // true
 ```
 
 #### `isDestroyed`