diff --git a/Extending-Caddy.md b/Extending-Caddy.md
index e4bc021..117a930 100644
--- a/Extending-Caddy.md
+++ b/Extending-Caddy.md
@@ -29,6 +29,7 @@ Start a new Go package with an init function and register your plugin with Caddy
 
 ```go
 import "github.com/mholt/caddy"
+import "github.com/mholt/caddy/caddytls"
 
 func init() {
 	// register a "generic" plugin, like a directive or middleware
@@ -45,7 +46,7 @@ func init() {
 	caddy.RegisterEventHook("eventName", myHookFn)
 
 	// register a cluster plugin
-	caddy.RegisterClusterPlugin("name", constructorFn)
+	caddytls.RegisterClusterPlugin("name", constructorFn)
 
 	// add a function that wraps listeners for the HTTP server
 	// (it's more common for a directive to call this rather than a standalone plugin)