diff --git a/README.md b/README.md
index 64dc81117..2304d2f04 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,6 @@
 ### Array
 * [Array concatenation](#array-concatenation)
 * [Array difference](#array-difference)
-* [Array includes](#array-includes)
 * [Array intersection](#array-intersection)
 * [Array remove](#array-remove)
 * [Array sample](#array-sample)
@@ -153,19 +152,6 @@ const difference = (a, b) => { const s = new Set(b); return a.filter(x => !s.has
 
 [⬆ back to top](#table-of-contents)
 
-### Array includes
-
-Use `slice()` to offset the array/string and `indexOf()` to check if the value is included.
-Omit the last argument, `fromIndex`, to check the whole array/string.
-
-```js
-const includes = (collection, val, fromIndex=0) => collection.slice(fromIndex).indexOf(val) != -1;
-// includes("30-seconds-of-code", "code") -> true
-// includes([1, 2, 3, 4], [1, 2], 1) -> false
-```
-
-[⬆ back to top](#table-of-contents)
-
 ### Array intersection
 
 Create a `Set` from `b`, then use `Array.filter()` on `a` to only keep values contained in `b`.
diff --git a/snippets/array-includes.md b/snippets/array-includes.md
deleted file mode 100644
index 16fa578a5..000000000
--- a/snippets/array-includes.md
+++ /dev/null
@@ -1,11 +0,0 @@
-### Array includes
-
-Use `slice()` to offset the array/string and `indexOf()` to check if the value is included.
-Omit the last argument, `fromIndex`, to check the whole array/string.
-
-In [ES6](http://www.ecma-international.org/ecma-262/7.0/#sec-array.prototype.includes), you can use a similar native `.includes()` function.
-```js
-const includes = (collection, val, fromIndex=0) => collection.slice(fromIndex).indexOf(val) != -1;
-// includes("30-seconds-of-code", "code") -> true
-// includes([1, 2, 3, 4], [1, 2], 1) -> false
-```
diff --git a/tag_database b/tag_database
index 05dc761bd..bd508483b 100644
--- a/tag_database
+++ b/tag_database
@@ -2,7 +2,6 @@
 anagrams-of-string-(with-duplicates):string
 array-concatenation:array
 array-difference:array
-array-includes:array
 array-intersection:array
 array-remove:array
 array-sample:array