diff --git a/README.md b/README.md
index ba60d75..336cfa5 100644
--- a/README.md
+++ b/README.md
@@ -32,14 +32,240 @@ go install github.com/thames-technology/apigen
 
 ## Getting started
 
-Create standard `BookService` definition with `author` parent resource in `proto/bookservice/v1alpha1/service.proto`:
+Create `BookService` with `author` parent resource:
 
 ```sh
 apigen proto -r book -p author -pkg bookservice.v1alpha1 -w
 ```
 
-Create standard `AuthorService` definition without a parent resource in `proto/authorservice/v1alpha1/service.proto`:
+This will generate the following standard API definitions in `proto/bookservice/v1alpha1/service.proto`:
+
+```proto
+syntax = "proto3";
+
+package bookservice.v1alpha1;
+
+import "google/protobuf/empty.proto";
+import "google/protobuf/field_mask.proto";
+import "google/protobuf/timestamp.proto";
+
+// =============================================================================
+// Service definition
+// =============================================================================
+
+// The BookService defines the standard methods for managing books.
+service BookService {
+  // Creates a new book in the library.
+  rpc CreateBook(CreateBookRequest) returns (CreateBookResponse);
+  // Retrieves a book by its ID.
+  rpc GetBook(GetBookRequest) returns (GetBookResponse);
+  // Lists books with pagination support.
+  rpc ListBooks(ListBooksRequest) returns (ListBooksResponse);
+  // Updates an existing book.
+  rpc UpdateBook(UpdateBookRequest) returns (UpdateBookResponse);
+  // Deletes a book by its ID.
+  rpc DeleteBook(DeleteBookRequest) returns (google.protobuf.Empty);
+}
+
+// =============================================================================
+// Service request and response messages
+// =============================================================================
+
+// Request message for CreateBook method.
+message CreateBookRequest {
+  // The book to be created.
+  Book book = 1;
+}
+
+// Response message for CreateBook method.
+message CreateBookResponse {
+  // The created book.
+  Book book = 1;
+}
+
+// Request message for GetBook method.
+message GetBookRequest {
+  // ID of the book to retrieve.
+  string id = 1;
+}
+
+// Response message for GetBook method.
+message GetBookResponse {
+  // The retrieved book.
+  Book book = 1;
+}
+
+// Request message for ListBooks method.
+message ListBooksRequest {
+  // The maximum number of books to return.
+  int32 page_size = 1;
+  // The token to retrieve the next page of results.
+  string page_token = 2;
+  // The ID of the parent resource.
+  string parent_id = 3;
+}
+
+// Response message for ListBooks method.
+message ListBooksResponse {
+  // The list of books.
+  repeated Book results = 1;
+  // Token to retrieve the next page of results.
+  string next_page_token = 2;
+  // Estimated total number of results.
+  int32 total_results_estimate = 3;
+}
+
+// Request message for UpdateBook method.
+message UpdateBookRequest {
+  // The book to be updated.
+  Book book = 1;
+  // The field mask specifying the fields to update.
+  google.protobuf.FieldMask update_mask = 2;
+}
+
+// Response message for UpdateBook method.
+message UpdateBookResponse {
+  // The updated book.
+  Book book = 1;
+}
+
+// Request message for DeleteBook method.
+message DeleteBookRequest {
+  // ID of the book to delete.
+  string id = 1;
+}
+
+// =============================================================================
+// Resource messages
+// =============================================================================
+
+// The Book message represents a book in the library.
+message Book {
+  // Unique identifier for the book.
+  string id = 1;
+  // When the book was created.
+  google.protobuf.Timestamp create_time = 2;
+  // When the book was last updated.
+  google.protobuf.Timestamp update_time = 3;
+  // ID of the author of the book.
+  string author_id = 4;
+}
+```
+
+Create `AuthorService` definition without a parent resource:
 
 ```sh
 apigen proto -r author -pkg authorservice.v1alpha1 -w
 ```
+
+This will generate the following standard API definitions in `proto/authorservice/v1alpha1/service.proto`:
+
+```proto
+syntax = "proto3";
+
+package authorservice.v1alpha1;
+
+import "google/protobuf/empty.proto";
+import "google/protobuf/field_mask.proto";
+import "google/protobuf/timestamp.proto";
+
+// =============================================================================
+// Service definition
+// =============================================================================
+
+// The AuthorService defines the standard methods for managing authors.
+service AuthorService {
+  // Creates a new author in the library.
+  rpc CreateAuthor(CreateAuthorRequest) returns (CreateAuthorResponse);
+  // Retrieves a author by its ID.
+  rpc GetAuthor(GetAuthorRequest) returns (GetAuthorResponse);
+  // Lists authors with pagination support.
+  rpc ListAuthors(ListAuthorsRequest) returns (ListAuthorsResponse);
+  // Updates an existing author.
+  rpc UpdateAuthor(UpdateAuthorRequest) returns (UpdateAuthorResponse);
+  // Deletes a author by its ID.
+  rpc DeleteAuthor(DeleteAuthorRequest) returns (google.protobuf.Empty);
+}
+
+// =============================================================================
+// Service request and response messages
+// =============================================================================
+
+// Request message for CreateAuthor method.
+message CreateAuthorRequest {
+  // The author to be created.
+  Author author = 1;
+}
+
+// Response message for CreateAuthor method.
+message CreateAuthorResponse {
+  // The created author.
+  Author author = 1;
+}
+
+// Request message for GetAuthor method.
+message GetAuthorRequest {
+  // ID of the author to retrieve.
+  string id = 1;
+}
+
+// Response message for GetAuthor method.
+message GetAuthorResponse {
+  // The retrieved author.
+  Author author = 1;
+}
+
+// Request message for ListAuthors method.
+message ListAuthorsRequest {
+  // The maximum number of authors to return.
+  int32 page_size = 1;
+  // The token to retrieve the next page of results.
+  string page_token = 2;
+  // The ID of the parent resource.
+  string parent_id = 3;
+}
+
+// Response message for ListAuthors method.
+message ListAuthorsResponse {
+  // The list of authors.
+  repeated Author results = 1;
+  // Token to retrieve the next page of results.
+  string next_page_token = 2;
+  // Estimated total number of results.
+  int32 total_results_estimate = 3;
+}
+
+// Request message for UpdateAuthor method.
+message UpdateAuthorRequest {
+  // The author to be updated.
+  Author author = 1;
+  // The field mask specifying the fields to update.
+  google.protobuf.FieldMask update_mask = 2;
+}
+
+// Response message for UpdateAuthor method.
+message UpdateAuthorResponse {
+  // The updated author.
+  Author author = 1;
+}
+
+// Request message for DeleteAuthor method.
+message DeleteAuthorRequest {
+  // ID of the author to delete.
+  string id = 1;
+}
+
+// =============================================================================
+// Resource messages
+// =============================================================================
+
+// The Author message represents a author in the library.
+message Author {
+  // Unique identifier for the author.
+  string id = 1;
+  // When the author was created.
+  google.protobuf.Timestamp create_time = 2;
+  // When the author was last updated.
+  google.protobuf.Timestamp update_time = 3;
+}
+```