Update sumPower.md

snippets/sumPower.md

@@ -1,6 +1,6 @@
 ### sumPower
 
-Returns the sum of the powers of all the numbers from `start` to `end`.
+Returns the sum of the powers of all the numbers from `start` to `end` (both inclusive).
 
 Use `Array.fill()` to create an array of all the numbers in the target range, `Array.map()` and the exponent operator (`**`) to raise them to `power` and `Array.reduce()` to add them together.
 Omit the second argument, `power`, to use a default power of `2`.
@@ -8,7 +8,7 @@ Omit the third argument, `start`, to use a default starting value of `1`.
 
 ```js
 const sumPower = (end,power = 2,start = 1) =>
-  Array(end - start).fill(0).map((x,i) => (i+start) ** power).reduce((a,b) => a+b,0)
+  Array(end + 1 - start).fill(0).map((x,i) => (i+start) ** power).reduce((a,b) => a+b,0)
 ```
 
 ```js