diff --git a/src/content/docs/waf/tools/lists/custom-lists.mdx b/src/content/docs/waf/tools/lists/custom-lists.mdx
index 7fa1776e6c4c42..955dc978878c9c 100644
--- a/src/content/docs/waf/tools/lists/custom-lists.mdx
+++ b/src/content/docs/waf/tools/lists/custom-lists.mdx
@@ -56,7 +56,7 @@ List items in custom lists with IP addresses must be in one of the following for
 
 - Individual IPv4 addresses
 - IPv4 CIDR ranges with a prefix from `/8` to `/32`
-- IPv6 CIDR ranges with a prefix from `/4` to `/64`
+- IPv6 CIDR ranges with a prefix from `/12` to `/64`
 
 You can combine individual addresses and CIDR ranges in the same list.