diff --git a/not_cloudflare/cidr_data/README.md b/not_cloudflare/cidr_data/README.md
index 29898f13..075b7bb7 100644
--- a/not_cloudflare/cidr_data/README.md
+++ b/not_cloudflare/cidr_data/README.md
@@ -1 +1,5 @@
-CDN CIDR(IPv4) list
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+CDN CIDR(IPv4) list
+(used by sx)
+
+
+Cloudflare CIDR is [cloudflare_inc/cloudflare_CIDR_v4.txt](../../cloudflare_inc/cloudflare_CIDR_v4.txt)
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