diff --git a/arrays-and-slices.md b/arrays-and-slices.md
index 39c919ed..b9af4f82 100644
--- a/arrays-and-slices.md
+++ b/arrays-and-slices.md
@@ -5,7 +5,7 @@
 Arrays allow you to store multiple elements of the same type in a variable in
 a particular order.
 
-When you have an array, it is very common to have to iterate over them. So let's
+When you have arrays, it is very common to have to iterate over them. So let's
 use [our new-found knowledge of `for`](iteration.md) to make a `Sum` function. `Sum` will
 take an array of numbers and return the total.