diff --git a/expectations.md b/expectations.md
index 8a9d182..b35b036 100644
--- a/expectations.md
+++ b/expectations.md
@@ -107,6 +107,7 @@ With the Pest expectation API, you have access to an extensive collection of ind
 - [`toHaveSameSize()`](#expect-toHaveSameSize)
 - [`toBeUrl()`](#expect-toBeUrl)
 - [`toBeUuid()`](#expect-toBeUuid)
+- [`toBeUlid()`](#expect-toBeUlid)
 
 </div>
 
@@ -839,6 +840,15 @@ This expectation ensures that `$value` is an UUID.
 expect('ca0a8228-cdf6-41db-b34b-c2f31485796c')->toBeUuid();
 ```
 
+<a name="expect-toBeUlid"></a>
+### `toBeUlid()`
+
+This expectation ensures that `$value` is a ULID.
+
+```php
+expect('01ARZ3NDEKTSV4RRFFQ69G5FAV')->toBeUlid();
+```
+
 ---
 
 <a name="expect-and"></a>