diff --git a/package.json b/package.json
index 3e388ef..9240130 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@wrtnio/openai-function-schema",
-  "version": "0.2.5",
+  "version": "0.2.6",
   "description": "OpenAI LLM function schema from OpenAPI (Swagger) document",
   "main": "lib/index.js",
   "typings": "lib/index.d.ts",
diff --git a/src/OpenAiComposer.ts b/src/OpenAiComposer.ts
index ef86e19..6aeb926 100644
--- a/src/OpenAiComposer.ts
+++ b/src/OpenAiComposer.ts
@@ -132,6 +132,7 @@ export namespace OpenAiComposer {
       .filter((v): v is IOpenAiFunction => v !== null);
     return {
       openapi: "3.0.3",
+      version: swagger.info?.version,
       functions,
       errors,
       options,
diff --git a/src/structures/IOpenAiDocument.ts b/src/structures/IOpenAiDocument.ts
index e58310e..1379906 100644
--- a/src/structures/IOpenAiDocument.ts
+++ b/src/structures/IOpenAiDocument.ts
@@ -61,6 +61,13 @@ export interface IOpenAiDocument {
    */
   openapi: "3.0.3";
 
+  /**
+   * Version of the target document.
+   *
+   * Exactly same with {@link ISwagger.info.version} of the source.
+   */
+  version?: string;
+
   /**
    * List of function metadata.
    *
diff --git a/src/structures/IOpenAiFunction.ts b/src/structures/IOpenAiFunction.ts
index fec42f3..d777c85 100644
--- a/src/structures/IOpenAiFunction.ts
+++ b/src/structures/IOpenAiFunction.ts
@@ -48,6 +48,7 @@ import { ISwaggerOperation } from "./ISwaggerOperation";
  * ]
  * ```
  *
+ * @reference https://platform.openai.com/docs/guides/function-calling
  * @author Samchon
  */
 export interface IOpenAiFunction {
@@ -63,6 +64,34 @@ export interface IOpenAiFunction {
 
   /**
    * Representative name of the function.
+   *
+   * The `name` is a repsentative name identifying the function in the
+   * {@link IOpenAiDocument}. The `name` value is just composed by joining the
+   * {@link IMigrateRoute.accessor} by underscore `_` character.
+   *
+   * Here is the composition rule of the  {@link IMigrateRoute.accessor}:
+   *
+   * > The `accessor` is composed with the following rules. At first, namespaces
+   * > are composed by static directory names in the {@link path}. Parametric
+   * > symbols represented by `:param` or `{param}` cannot be a part of the
+   * > namespace.
+   * >
+   * > Instead, they would be a part of the function name. The function
+   * > name is composed with the {@link method HTTP method} and parametric symbols
+   * > like `getByParam` or `postByParam`. If there are multiple path parameters,
+   * > they would be concatenated by `And` like `getByParam1AndParam2`.
+   * >
+   * > For refefence, if the {@link operation}'s {@link method} is `delete`, the
+   * > function name would be replaced to `erase` instead of `delete`. It is
+   * > the reason why the `delete` is a reserved keyword in many programming
+   * > languages.
+   * >
+   * > - Example 1
+   * >   - path: `POST /shopping/sellers/sales`
+   * >   - accessor: `shopping.sellers.sales.post`
+   * > - Example 2
+   * >   - endpoint: `GET /shoppings/sellers/sales/:saleId/reviews/:reviewId/comments/:id
+   * >   - accessor: `shoppings.sellers.sales.reviews.getBySaleIdAndReviewIdAndCommentId`
    */
   name: string;
 
@@ -123,6 +152,17 @@ export interface IOpenAiFunction {
 
   /**
    * Description of the function.
+   *
+   * Composed by such rule:
+   *
+   * 1. Starts from the {@link OpenApi.IOperation.summary} paragraph.
+   * 2. The next paragraphs are filled with the {@link OpenApi.IOperation.description}.
+   *    By the way, if the first paragraph of {@link OpenApi.IOperation.description} is same
+   *    with the {@link OpenApi.IOperation.summary}, it would not be duplicated.
+   * 3. Parameters' descriptions are added with `@param` tag.
+   * 4. {@link OpenApi.IOperation.security Security requirements} are added with `@security` tag.
+   * 5. Tag names are added with `@tag` tag.
+   * 6. If {@link OpenApi.IOperation.deprecated}, `@deprecated` tag is added.
    */
   description?: string;
 
diff --git a/test/keyword.json b/test/keyword.json
index f87fa36..eb92ca8 100644
--- a/test/keyword.json
+++ b/test/keyword.json
@@ -1,5 +1,6 @@
 {
   "openapi": "3.0.3",
+  "version": "0.0.2",
   "functions": [
     {
       "method": "post",
diff --git a/test/plain.json b/test/plain.json
index 63c2532..38510f5 100644
--- a/test/plain.json
+++ b/test/plain.json
@@ -1,5 +1,6 @@
 {
   "openapi": "3.0.3",
+  "version": "0.0.2",
   "functions": [
     {
       "method": "post",
diff --git a/test/positional.json b/test/positional.json
index a697ac5..8801149 100644
--- a/test/positional.json
+++ b/test/positional.json
@@ -1,5 +1,6 @@
 {
   "openapi": "3.0.3",
+  "version": "0.0.2",
   "functions": [
     {
       "method": "post",