diff --git a/9. ES6/README.md b/9. ES6/README.md
index 568817a..b3df80d 100644
--- a/9. ES6/README.md	
+++ b/9. ES6/README.md	
@@ -745,47 +745,3 @@ var y = false;
 
 console.log(x,y);
 ```
-
-<details><summary>Note</summary>
-The reason this is special and new is because we have to
-remember that array values are normally passed by reference.
-It is also unusual to have an array that is not assigned to a variable
-
-```JavaScript
-// Pass by reference
-var a =  1;
-var b =  2;
-
-var originalArray = [a,b];
-console.log('is `a` equal to orginalArray[0]:', a === originalArray[0]);//true
-
-var newArray = originalArray;
-
-//will reverse BOTH arrays (because it is actually two references to the same array)
-newArray.reverse()
-
-console.log('This is newArray.reverse():', newArray)
-console.log('This is originalArray after newArray has been reversed', originalArray)
-console.log('is `a` equal to orginalArray[0]:', a === originalArray[0]);//false
-```
-
-To make a duplicate array that is not passed by reference, you would have to do something like:
-
-```JavaScript
-var a =  1;
-var b =  2;
-
-var anotherOriginalArray = [a,b];
-console.log('is `a` equal to anotherOrginalArray[0]:', a === anotherOriginalArray[0]);//true
-
-var trueNewArray = anotherOriginalArray.map(function(e){
-    return e;
-});
-
-console.log('this is trueNewArray', trueNewArray);
-trueNewArray.reverse();
-console.log('\nThis is trueNewArray.reverse():', trueNewArray);
-console.log('This is anotherOriginalArray after trueNewArray has been reversed', anotherOriginalArray);
-console.log('is `a` equal to anotherOriginalArray[0]:', anotherOriginalArray[0] === a); //true
-```
-</details>