diff --git a/chai/chai-3.2.0-tests.ts b/chai/chai-3.2.0-tests.ts
index 9b646b1529..cb1b74b8f1 100644
--- a/chai/chai-3.2.0-tests.ts
+++ b/chai/chai-3.2.0-tests.ts
@@ -1930,6 +1930,24 @@ suite('assert', () => {
         }, 'expected 5 to be below 5');
     });
 
+    test('isAtLeast', () => {
+        assert.isAtLeast(5, 3);
+        assert.isAtLeast(5, 5);
+
+        err(() => {
+            assert.isAtLeast(3, 5);
+        }, 'expected 3 to be greater than or equal to 5');
+    });
+
+    test('isAtMost', () => {
+        assert.isAtMost(3, 5);
+        assert.isAtMost(5, 5);
+
+        err(() => {
+            assert.isAtMost(5, 3);
+        }, 'expected 5 to be less than or equal to 3');
+    });
+
     test('extensible', () => { assert.extensible({}); });
     test('isExtensible', () => { assert.isExtensible({}); });
     test('notExtensible', () => { assert.notExtensible(Object.preventExtensions({})); });
diff --git a/chai/chai-3.2.0.d.ts b/chai/chai-3.2.0.d.ts
index 87b0c08e6f..6dc653b72f 100644
--- a/chai/chai-3.2.0.d.ts
+++ b/chai/chai-3.2.0.d.ts
@@ -271,6 +271,9 @@ declare namespace Chai {
         isAbove(val: number, abv: number, msg?: string): void;
         isBelow(val: number, blw: number, msg?: string): void;
 
+        isAtMost(val: number, atmst: number, msg?: string): void;
+        isAtLeast(val: number, atlst: number, msg?: string): void;
+
         isFunction(val: any, msg?: string): void;
         isNotFunction(val: any, msg?: string): void;