diff --git a/src/content/docs/support/troubleshooting/http-status-codes/cloudflare-1xxx-errors/error-1001.mdx b/src/content/docs/support/troubleshooting/http-status-codes/cloudflare-1xxx-errors/error-1001.mdx
index 608b704b045b622..b931983cd8837fc 100644
--- a/src/content/docs/support/troubleshooting/http-status-codes/cloudflare-1xxx-errors/error-1001.mdx
+++ b/src/content/docs/support/troubleshooting/http-status-codes/cloudflare-1xxx-errors/error-1001.mdx
@@ -14,7 +14,8 @@ This error indicates a DNS resolution failure preventing access to the requested
 - An external domain that is not on using Cloudflare has a CNAME record to a domain active on Cloudflare
 - The target of the DNS CNAME record does not resolve.
 - A CNAME record in your Cloudflare DNS app requires resolution via a DNS provider that is currently offline.
-- [Always Online](/cache/how-to/always-online/) is enabled for a [Custom Hostname (Cloudflare for SaaS)](/cloudflare-for-platforms/cloudflare-for-saas/) domain.
+- [Always Online](/cache/how-to/always-online/) is enabled for a [custom hostname (Cloudflare for SaaS)](/cloudflare-for-platforms/cloudflare-for-saas/) domain.
+- An A record for a subdomain (`www.example.com`) points to the IP address of a [wildcard custom hostname (Cloudflare for SaaS)](/cloudflare-for-platforms/cloudflare-for-saas/) (`*.example.com`).
 
 ### Resolution
 
@@ -22,4 +23,7 @@ A non-Cloudflare domain cannot CNAME to a Cloudflare domain, unless the non-Clou
 
 Attempting to directly access DNS records used for [Cloudflare CNAME setups](/dns/zone-setups/partial-setup) also causes error 1001. For example, `www.example.com.cdn.cloudflare.net`.
 
-Disable [Always Online](/cache/how-to/always-online/#enable-always-online), if using [Custom Hostname (Cloudflare for SaaS)](/cloudflare-for-platforms/cloudflare-for-saas/) domain.
+Disable [Always Online](/cache/how-to/always-online/#enable-always-online), if using [custom hostname (Cloudflare for SaaS)](/cloudflare-for-platforms/cloudflare-for-saas/) domain.
+
+Use a CNAME record for subdomains pointing to a wildcard custom hostname. 
+Please also note that [o2o](/cloudflare-for-platforms/cloudflare-for-saas/saas-customers/how-it-works/) only applies when the CNAME points to the target defined by the SaaS provider (`customers.saasprovider.com`), not to the [apex proxying IP](/cloudflare-for-platforms/cloudflare-for-saas/saas-customers/how-it-works/#prerequisites).