diff --git a/src/config/ConfigOptions.ts b/src/config/ConfigOptions.ts
index f8f3ba1..e799d59 100644
--- a/src/config/ConfigOptions.ts
+++ b/src/config/ConfigOptions.ts
@@ -30,6 +30,8 @@ export interface ConfigOptions {
   };
 }
 
+// Overrides members from ConfigOptions that are always provided by the
+// default config and are therefore non-optional.
 export interface ResolvedConfigOptions extends ConfigOptions {
   default_server_config: {
     ["m.homeserver"]: {