diff --git a/README.md b/README.md
index 453683c..a577539 100644
--- a/README.md
+++ b/README.md
@@ -22,6 +22,8 @@
 
 [GoDNS](https://github.com/TimothyYe/godns) is a dynamic DNS (DDNS) client tool. It is a rewrite in [Go](https://golang.org) of my early [DynDNS](https://github.com/TimothyYe/DynDNS) open source project.
 
+Currently supports updating A records for subdomains. Doesn't support updating of root domains.
+
 ---
 - [Supported DNS Providers](#supported-dns-providers)
 - [Supported Platforms](#supported-platforms)