diff --git a/src/lib/es2025.float16.d.ts b/src/lib/es2025.float16.d.ts
index 6a1f600040d75..1794e7ae389c2 100644
--- a/src/lib/es2025.float16.d.ts
+++ b/src/lib/es2025.float16.d.ts
@@ -400,13 +400,22 @@ interface Float16ArrayConstructor {
 }
 declare var Float16Array: Float16ArrayConstructor;
 
-interface Math {
-    /**
-     * Returns the nearest half precision float representation of a number.
-     * @param x A numeric expression.
-     */
-    f16round(x: number): number;
-}
+interface Math {
+    /**
+     * Returns the nearest half precision float representation of a number.
+     * @param x A numeric expression.
+     */
+    f16round(x: number): number;
+    /**
+     * Returns the sum of the values in the iterable using a more precise
+     * summation algorithm than naive floating-point addition.
+     * Returns `-0` if the iterable is empty.
+     * @param numbers An iterable (such as an Array) of numbers.
+     * @throws {TypeError} If `numbers` is not iterable, or if any value in the iterable is not of type `number`.
+     * @throws {RangeError} If the iterable yields 2^53 or more values.
+     */
+    sumPrecise(numbers: Iterable<number>): number;
+}
 
 interface DataView<TArrayBuffer extends ArrayBufferLike> {
     /**