diff --git a/README.md b/README.md
index 2bf515c..6ec59d5 100644
--- a/README.md
+++ b/README.md
@@ -183,8 +183,12 @@ The following function uses the `htmlspecialchars` function
 with specific flags to ensure proper encoding:
 
 ```php
-function html(string $text = null): string
+function html(?string $text = null): string
 {
+    if (null === $text) {
+        return '';
+    }
+
     return htmlspecialchars($text, ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8');
 }
 ```