diff --git a/lib/chai/core/assertions.js b/lib/chai/core/assertions.js
index f2b72ac89..fcca6bf2f 100644
--- a/lib/chai/core/assertions.js
+++ b/lib/chai/core/assertions.js
@@ -348,7 +348,7 @@ module.exports = function (chai, _) {
   /**
    * ### .empty
    *
-   * Asserts that the target's length is `0`. For arrays, it checks
+   * Asserts that the target's length is `0`. For arrays and strings, it checks
    * the `length` property. For objects, it gets the count of
    * enumerable keys.
    *