diff --git a/v2:-Writing-a-Module.md b/v2:-Writing-a-Module.md
index c304bb2..35e2138 100644
--- a/v2:-Writing-a-Module.md
+++ b/v2:-Writing-a-Module.md
@@ -97,7 +97,7 @@ Apps are modules which define their own top-level namespace, and which appear in
 }
 ```
 
-Example apps are `http` and `tls`. Their module name and namespace are the same. Guest modules use a namespace inherited from their host module. For example, HTTP handlers use the `http.handlers` namespace and TLS certificate loaders use the `tls.certificates` namespace.
+Example apps are `http` and `tls`. Their module name and namespace are the same. Guest modules use a namespace inherited from their host module. For example, HTTP handlers use the `http.handlers` namespace and TLS certificate loaders use the `tls.certificates` namespace. App modules implement the `caddy.App` interface.
 
 ## Namespaces
 
@@ -148,6 +148,7 @@ The configuration for Gadget would come in on the GadgetRaw field and then your
 
 | Kind of module | Namespace | Interface |
 | -------------- | --------- | --------- |
+| Caddy app | | caddy.App | 
 | HTTP handler | `http.handlers` | caddyhttp.MiddlewareHandler |
 | HTTP encoder | `http.encoders` | caddyhttp.Encoder |
 | HTTP request matcher | `http.matchers` | caddyhttp.RequestMatcher |