diff --git a/src/content/docs/cache/how-to/cache-rules/settings.mdx b/src/content/docs/cache/how-to/cache-rules/settings.mdx
index 1124ef302ac0086..024bc2dedcece08 100644
--- a/src/content/docs/cache/how-to/cache-rules/settings.mdx
+++ b/src/content/docs/cache/how-to/cache-rules/settings.mdx
@@ -246,7 +246,6 @@ This rule can also be used to specify Cache Reserve eligibility for website reso
 Cloudflare will still enforce the plan-based [cacheable file limits](/cache/concepts/default-cache-behavior/#customization-options-and-limits) when using this configuration. 
 :::
 
-
 <Details header="API information">
 
 API configuration object name: `"cache_reserve"`.
@@ -263,6 +262,10 @@ API property name for enabling Cache Reserve: `"eligible"` (boolean).
 }
 ```
 
+:::note
+If `minimum_file_size` is omitted and `eligible` is true, Cloudflare will use 0 bytes by default.
+:::
+
 Refer to [Create a cache rule via API](/cache/how-to/cache-rules/create-api/#example-requests) for complete API examples.