diff --git a/cfg/conf.sample.php b/cfg/conf.sample.php
index 52f152e..6b266a7 100644
--- a/cfg/conf.sample.php
+++ b/cfg/conf.sample.php
@@ -128,7 +128,8 @@ markdown = "Markdown"
 limit = 10
 
 ; (optional) if you only want some source IP addresses to create pastes
-; enter their IPv4 address(es) here, separated by commas
+; enter their IPv4 address(es) here, separated by commas. This does not
+; currently support CIDR notation, only individual IPv4 addresses.
 ; whitelist_paste_creation = "12.34.56.78,99.88.77.66"
 
 ; (optional) if your website runs behind a reverse proxy or load balancer,