diff --git a/docs/HyperIndex/Guides/configuration-file.mdx b/docs/HyperIndex/Guides/configuration-file.mdx
index 911f8cc6..d1873363 100644
--- a/docs/HyperIndex/Guides/configuration-file.mdx
+++ b/docs/HyperIndex/Guides/configuration-file.mdx
@@ -48,6 +48,11 @@ networks:
 
 Set the address of the smart contract you're indexing.
 
+:::note
+Addresses can be provided in **checksum** format or in **lowercase**.
+Envio accepts both and normalizes them internally.
+:::
+
 **Single address:**
 
 ```yaml