diff --git a/README.md b/README.md
index bed743a0..4bc34c88 100644
--- a/README.md
+++ b/README.md
@@ -3010,8 +3010,8 @@ endpoints:
       - "[CERTIFICATE_EXPIRATION] > 240h"
 ```
 
-> ⚠ The usage of the `[DOMAIN_EXPIRATION]` placeholder requires Gatus to send a request to the official IANA WHOIS service [through a library](https://github.com/TwiN/whois)
-> and in some cases, a secondary request to a TLD-specific WHOIS server (e.g. `whois.nic.sh`).
+> ⚠ The usage of the `[DOMAIN_EXPIRATION]` placeholder requires Gatus to use RDAP, or as a fallback, send a request to the official IANA WHOIS service 
+> [through a library](https://github.com/TwiN/whois) and in some cases, a secondary request to a TLD-specific WHOIS server (e.g. `whois.nic.sh`).
 > To prevent the WHOIS service from throttling your IP address if you send too many requests, Gatus will prevent you from
 > using the `[DOMAIN_EXPIRATION]` placeholder on an endpoint with an interval of less than `5m`.