diff --git a/src/lib/es7.d.ts b/src/lib/es7.d.ts
index f5dac64b43c..17b3eaac1d3 100644
--- a/src/lib/es7.d.ts
+++ b/src/lib/es7.d.ts
@@ -2,7 +2,7 @@ interface Array<T> {
     /**
       * Determines whether an array includes a certain element, returning true or false as appropriate.
       * @param searchElement The element to search for.
-      * @param fromIndex  The position in this array at which to begin searching for searchElement.
+      * @param fromIndex The position in this array at which to begin searching for searchElement.
       */
     includes(searchElement: T, fromIndex?: number): boolean;
 }
@@ -11,16 +11,16 @@ interface Int8Array {
     /**
       * Determines whether an array includes a certain element, returning true or false as appropriate.
       * @param searchElement The element to search for.
-      * @param fromIndex  The position in this array at which to begin searching for searchElement.
+      * @param fromIndex The position in this array at which to begin searching for searchElement.
       */
-    includes(searchElement: Int8Array, fromIndex?: number): boolean;
+    includes(searchElement: number, fromIndex?: number): boolean;
 }
 
 interface Uint8Array {
     /**
       * Determines whether an array includes a certain element, returning true or false as appropriate.
       * @param searchElement The element to search for.
-      * @param fromIndex  The position in this array at which to begin searching for searchElement.
+      * @param fromIndex The position in this array at which to begin searching for searchElement.
       */
     includes(searchElement: number, fromIndex?: number): boolean;
 }
@@ -29,7 +29,7 @@ interface Uint8ClampedArray {
     /**
       * Determines whether an array includes a certain element, returning true or false as appropriate.
       * @param searchElement The element to search for.
-      * @param fromIndex  The position in this array at which to begin searching for searchElement.
+      * @param fromIndex The position in this array at which to begin searching for searchElement.
       */
     includes(searchElement: number, fromIndex?: number): boolean;
 }
@@ -38,7 +38,7 @@ interface Int16Array {
     /**
       * Determines whether an array includes a certain element, returning true or false as appropriate.
       * @param searchElement The element to search for.
-      * @param fromIndex  The position in this array at which to begin searching for searchElement.
+      * @param fromIndex The position in this array at which to begin searching for searchElement.
       */
     includes(searchElement: number, fromIndex?: number): boolean;
 }
@@ -47,7 +47,7 @@ interface Uint16Array {
     /**
       * Determines whether an array includes a certain element, returning true or false as appropriate.
       * @param searchElement The element to search for.
-      * @param fromIndex  The position in this array at which to begin searching for searchElement.
+      * @param fromIndex The position in this array at which to begin searching for searchElement.
       */
     includes(searchElement: number, fromIndex?: number): boolean;
 }
@@ -56,7 +56,7 @@ interface Int32Array {
     /**
       * Determines whether an array includes a certain element, returning true or false as appropriate.
       * @param searchElement The element to search for.
-      * @param fromIndex  The position in this array at which to begin searching for searchElement.
+      * @param fromIndex The position in this array at which to begin searching for searchElement.
       */
     includes(searchElement: number, fromIndex?: number): boolean;
 }
@@ -65,7 +65,7 @@ interface Uint32Array {
     /**
       * Determines whether an array includes a certain element, returning true or false as appropriate.
       * @param searchElement The element to search for.
-      * @param fromIndex  The position in this array at which to begin searching for searchElement.
+      * @param fromIndex The position in this array at which to begin searching for searchElement.
       */
     includes(searchElement: number, fromIndex?: number): boolean;
 }
@@ -74,7 +74,7 @@ interface Float32Array {
     /**
       * Determines whether an array includes a certain element, returning true or false as appropriate.
       * @param searchElement The element to search for.
-      * @param fromIndex  The position in this array at which to begin searching for searchElement.
+      * @param fromIndex The position in this array at which to begin searching for searchElement.
       */
     includes(searchElement: number, fromIndex?: number): boolean;
 }
@@ -83,7 +83,7 @@ interface Float64Array {
     /**
       * Determines whether an array includes a certain element, returning true or false as appropriate.
       * @param searchElement The element to search for.
-      * @param fromIndex  The position in this array at which to begin searching for searchElement.
+      * @param fromIndex The position in this array at which to begin searching for searchElement.
       */
     includes(searchElement: number, fromIndex?: number): boolean;
 }
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