Update modules/reference/pages/properties/object-storage-properties.adoc

Author: Deflaimun

modules/reference/pages/properties/object-storage-properties.adoc

@@ -327,6 +327,8 @@ This property works together with <<cloud_storage_cache_size_percent,`cloud_stor
 
 - These properties cannot both be `0`.
 
+- `cloud_storage_cache_size` cannot be `0` while `cloud_storage_cache_size_percent` is `null`.
+
 *Unit*: bytes
 
 *Requires restart:* No