diff --git a/examples/petstore-v2.ts b/examples/petstore-v2.ts
index 6c5cc83..cb25d56 100644
--- a/examples/petstore-v2.ts
+++ b/examples/petstore-v2.ts
@@ -33,10 +33,8 @@ export class ApiClient {
 
   async ParseError(rep: Response) {
     try {
-      // try to parse domain error from response body
       return await rep.json()
     } catch (e) {
-      // otherwise return response as is
       throw rep
     }
   }
@@ -58,7 +56,7 @@ export class ApiClient {
     let body: FormData | URLSearchParams | string | undefined = undefined
 
     if (ct === "multipart/form-data" || ct === "application/x-www-form-urlencoded") {
-      headers.delete("content-type") // https://stackoverflow.com/a/61053359/3664464
+      headers.delete("content-type")
       body = ct === "multipart/form-data" ? new FormData() : new URLSearchParams()
       for (const [k, v] of Object.entries(opts.body as Record<string, string>)) {
         body.append(k, v)
diff --git a/examples/petstore-v3.ts b/examples/petstore-v3.ts
index 32041aa..d9e2adc 100644
--- a/examples/petstore-v3.ts
+++ b/examples/petstore-v3.ts
@@ -33,10 +33,8 @@ export class ApiClient {
 
   async ParseError(rep: Response) {
     try {
-      // try to parse domain error from response body
       return await rep.json()
     } catch (e) {
-      // otherwise return response as is
       throw rep
     }
   }
@@ -58,7 +56,7 @@ export class ApiClient {
     let body: FormData | URLSearchParams | string | undefined = undefined
 
     if (ct === "multipart/form-data" || ct === "application/x-www-form-urlencoded") {
-      headers.delete("content-type") // https://stackoverflow.com/a/61053359/3664464
+      headers.delete("content-type")
       body = ct === "multipart/form-data" ? new FormData() : new URLSearchParams()
       for (const [k, v] of Object.entries(opts.body as Record<string, string>)) {
         body.append(k, v)
diff --git a/readme.md b/readme.md
index dcfdd87..a1db186 100644
--- a/readme.md
+++ b/readme.md
@@ -3,10 +3,10 @@
 <div align="center">
 
 [<img src="https://badgen.net/npm/v/apigen-ts" alt="version" />](https://npmjs.org/package/apigen-ts)
-[<img src="https://github.com/vladkens/apigen-ts/workflows/test/badge.svg" alt="test status" />](https://github.com/vladkens/apigen-ts/actions)
 [<img src="https://badgen.net/packagephobia/publish/apigen-ts" alt="size" />](https://packagephobia.now.sh/result?p=apigen-ts)
 [<img src="https://badgen.net/npm/dm/apigen-ts" alt="downloads" />](https://npmjs.org/package/apigen-ts)
 [<img src="https://badgen.net/github/license/vladkens/apigen-ts" alt="license" />](https://github.com/vladkens/apigen-ts/blob/main/LICENSE)
+[<img src="https://badgen.net/static/-/buy%20me%20a%20coffee/ff813f?icon=buymeacoffee&label" alt="donate" />](https://buymeacoffee.com/vladkens)
 
 </div>
 
@@ -15,7 +15,7 @@
 </div>
 
 <div align="center">
-  TypeScript api client generator from OpenAPI specification
+  TypeScript HTTP Client Generator from OpenAPI Specification
 </div>
 
 ## Features
@@ -37,7 +37,7 @@ yarn install -D apigen-ts
 
 ## Usage
 
-### Generate
+### 1. Generate
 
 ```sh
 # From url
@@ -49,9 +49,9 @@ yarn apigen-ts ./openapi.json ./api-client.ts
 
 Run `yarn apigen-ts --help` for more options. See examples of generated clients [here](./examples/).
 
-### Import
+### 2. Import
 
-```typescript
+```ts
 import { ApiClient } from "./api-client"
 
 const api = new ApiClient({
@@ -60,9 +60,9 @@ const api = new ApiClient({
 })
 ```
 
-### Use
+### 3. Use
 
-```typescript
+```ts
 // GET /pet/{petId}
 await api.pet.getPetById(1) // -> Pet
 
@@ -77,18 +77,29 @@ await api.user.updateUser("username", { firstName: "John" })
 
 ### Login flow
 
-```typescript
+```ts
 const { token } = await api.auth.login({ usename, password })
 api.Config.headers = { Authorization: token }
 
 await api.protectedRoute.get() // here authenticated
 ```
 
+### Automatic date parsing
+
+```sh
+yarn apigen-ts ./openapi.json ./api-client.ts --parse-dates
+```
+
+```ts
+const pet = await api.pet.getPetById(1)
+const createdAt: Date = pet.createdAt // date parsed from string with format=date-time
+```
+
 ### NodeJS API
 
 Create file like `apigen.mjs` with content:
 
-```javascript
+```js
 import { apigen } from "apigen-ts"
 
 await apigen({
diff --git a/scripts/guru-check.ts b/scripts/guru-check.ts
index 05109c3..c65d0f6 100644
--- a/scripts/guru-check.ts
+++ b/scripts/guru-check.ts
@@ -1,7 +1,5 @@
 import { enumerate, filterNullable } from "array-utils-ts"
-import { exec } from "child_process"
 import fs from "fs/promises"
-import util from "node:util"
 import { loadSchema } from "../src/generator"
 import { apigen } from "../src/main"
 
@@ -53,7 +51,7 @@ const generateClients = async () => {
   for (const [i, file] of enumerate(files, 1)) {
     if (debugId && i !== debugId) continue
 
-    const src = `${BaseDir}/specs/${file}`
+    const src = await fs.realpath(`${BaseDir}/specs/${file}`)
     const out = `${BaseDir}/clients/${file.replace(".json", ".ts")}`
 
     const doc = JSON.parse(await fs.readFile(src, "utf-8"))
@@ -64,7 +62,7 @@ const generateClients = async () => {
     const tag = `[${i.toString().padStart(len, " ")}/${files.length}] (${ver}) ${src}`
 
     try {
-      await apigen({ source: src, output: out, parseDates: true })
+      await apigen({ source: `file://${src}`, output: out, parseDates: true })
       console.log(`${tag} generated`)
     } catch (err) {
       console.log(tag, "failed", err)
@@ -82,9 +80,12 @@ const generateClients = async () => {
   console.log(`versions: ${Object.entries(versions).map((x) => x.join(" - ")).join(", ")}`)
   if (failed.length) console.log(`failed ids: ${failed.join(", ")}`)
 
-  const cmd = `yarn tsc --noEmit ${BaseDir}/clients/*.ts`
-  const { stdout, stderr } = await util.promisify(exec)(cmd)
-  console.log(stdout, stderr)
+  // NODE_OPTIONS="--max-old-space-size=8192" yarn tsc --noEmit ${BaseDir}/clients/*.ts
+  // const cmd = `yarn tsc --noEmit ${BaseDir}/clients/*.ts`
+  // const { stdout, stderr } = await util.promisify(exec)(cmd, {
+  //   env: { ...process.env, NODE_OPTIONS: "--max-old-space-size=8192" },
+  // })
+  // console.log(stdout, stderr)
 }
 
 const main = async () => {
diff --git a/src/_template.ts b/src/_template.ts
index 72d0d47..ebc4719 100644
--- a/src/_template.ts
+++ b/src/_template.ts
@@ -57,7 +57,8 @@ export class ApiClient {
     let body: FormData | URLSearchParams | string | undefined = undefined
 
     if (ct === "multipart/form-data" || ct === "application/x-www-form-urlencoded") {
-      headers.delete("content-type") // https://stackoverflow.com/a/61053359/3664464
+      // https://stackoverflow.com/a/61053359/3664464
+      headers.delete("content-type")
       body = ct === "multipart/form-data" ? new FormData() : new URLSearchParams()
       for (const [k, v] of Object.entries(opts.body as Record<string, string>)) {
         body.append(k, v)
diff --git a/src/generator.ts b/src/generator.ts
index 5c43b3a..842edc7 100644
--- a/src/generator.ts
+++ b/src/generator.ts
@@ -232,6 +232,8 @@ export const generateAst = async (ctx: Context) => {
 }
 
 export const loadSchema = async (url: string, upgrade = true): Promise<Oas3Definition> => {
+  if (url.startsWith("file://")) url = url.substring(7)
+
   const { bundle } = await redocly.bundle({
     ref: url,
     config: await redocly.createConfig({}),
diff --git a/src/main.ts b/src/main.ts
index d7ae067..ed04530 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -17,16 +17,17 @@ export const apigen = async (config: Partial<Config> & Pick<Config, "source" | "
   let code = [
     `// Auto-generated by https://github.com/vladkens/apigen-ts`,
     `// Source: ${config.source}\n`,
-    ...file.split("\n").filter((x) => !x.startsWith("// Note: ")),
+    // remove all comments expect which starts with "// apigen:"
+    ...file.split("\n").filter((x) => !/\s*\/\/\s(?!apigen:)/.test(x)),
   ].join("\n")
 
   if (!ctx.parseDates) {
+    code = code.replace(/\s*ISO_FORMAT\s=.+$/gm, "")
     code = code.replace(/PopulateDates.+?\n\s{2}\}/s, "")
     code = code.replace(/this.PopulateDates\((.+)\)/, "$1")
   }
 
-  // broken types by design, but typescript still can print it
-  // need to keep original formatting & comments of the template
+  // broken type by design, need to keep original formatting (ts still can print it)
   code = code.replace("// apigen:modules", printCode(modules as unknown as ts.Statement[]))
   code = code.replace("// apigen:types", printCode(types))
   code = code.replace("class ApiClient", `class ${ctx.name}`)