diff --git a/_filters/default.md b/_filters/default.md
index 5366cb4..552fa5d 100644
--- a/_filters/default.md
+++ b/_filters/default.md
@@ -50,3 +50,21 @@ In this example, `product_price` is empty, so the default value is used.
 {% assign product_price = "" %}
 {{ product_price | default: 2.99 }}
 ```
+
+### Allowing `false` {%- include version-badge.html version="5.0.0" %}
+
+To allow variables to return `false` instead of the default value, you can use the `allow_false` parameter.
+
+<p class="code-label">Input</p>
+```liquid
+{% raw %}
+{% assign display_price = false %}
+{{ display_price | default: true, allow_false: true }}
+{% endraw %}
+```
+
+<p class="code-label">Output</p>
+```text
+
+false
+```