diff --git a/packages/next/server/config-shared.ts b/packages/next/server/config-shared.ts
index 9d576d624a8a06..d34267a7b35213 100644
--- a/packages/next/server/config-shared.ts
+++ b/packages/next/server/config-shared.ts
@@ -57,6 +57,7 @@ export interface WebpackConfigContext {
   isServer: boolean
   /**  The build id, used as a unique identifier between builds */
   buildId: string
+  /** The next.config.js merged with default values */
   config: NextConfigComplete
   /** Default loaders used internally by Next.js */
   defaultLoaders: {