diff --git a/base/docs/types/index.d.ts b/base/docs/types/index.d.ts
index 2b8408e0..c31a8185 100644
--- a/base/docs/types/index.d.ts
+++ b/base/docs/types/index.d.ts
@@ -1715,6 +1715,7 @@ interface Namespace {
 	*
 	*     -   **sh**: dimensions sorted in loop order.
 	*     -   **sx**: ndarray strides sorted in loop order.
+	*     -   **idx**: dimension indices sorted in loop order.
 	*
 	* -   When iterating over the elements of a multi-dimensional array, accessing elements which are closer in memory can improve performance. To this end, loop interchange is a technique used in loop nest optimization to improve locality of reference and take advantage of CPU cache.
 	*
@@ -1737,6 +1738,9 @@ interface Namespace {
 	*
 	* var ssx = o.sx;
 	* // returns [ 1, 4, 12 ]
+	*
+	* var idx = o.idx;
+	* // returns [ 2, 1, 0 ]
 	*/
 	nullaryLoopOrder: typeof nullaryLoopOrder;
 
diff --git a/docs/types/index.d.ts b/docs/types/index.d.ts
index 6fa0691c..b4a3aafb 100644
--- a/docs/types/index.d.ts
+++ b/docs/types/index.d.ts
@@ -21,6 +21,7 @@
 /* eslint-disable max-lines */
 
 import array = require( './../../array' );
+import ndat = require( './../../at' );
 import base = require( './../../base' );
 import broadcastArray = require( './../../broadcast-array' );
 import broadcastArrays = require( './../../broadcast-arrays' );
@@ -130,6 +131,35 @@ interface Namespace {
 	*/
 	array: typeof array;
 
+	/**
+	* Returns an ndarray element.
+	*
+	* ## Notes
+	*
+	* -   The number of index arguments must equal the number of ndarray dimensions.
+	* -   Negative indices are resolved relative to the last element along the respective dimension, with the last element corresponding to `-1`.
+	* -   If provided out-of-bounds indices, the function always returns `undefined`.
+	*
+	* @param x - input ndarray
+	* @param indices - index arguments
+	* @returns ndarray element
+	*
+	* @example
+	* var zeros = require( './../../zeros' );
+	*
+	* var x = zeros( [ 3, 3 ], {
+	*     'dtype': 'generic'
+	* });
+	* // returns <ndarray>
+	*
+	* var v = ns.ndat( x, 0, 0 );
+	* // returns 0
+	*
+	* v = ns.ndat( x, 5, 5 );
+	* // returns undefined
+	*/
+	ndat: typeof ndat;
+
 	/**
 	* Base ndarray.
 	*/