diff --git a/api.md b/api.md
index 0ba92e3..8b46431 100644
--- a/api.md
+++ b/api.md
@@ -6,15 +6,14 @@
   - [annotate](#annotate)
   - [compile](#compile)
   - [format](#format)
-- [TypeAlias](#typealias)
+- [Interface](#interface)
   - [AnnotateOptions](#annotateoptions)
+  - [CompileOptions](#compileoptions)
   - [FormatOptions](#formatoptions)
+  - [SFCParseError](#sfcparseerror)
 - [Enum](#enum)
   - [AnnotateWarningCodes](#annotatewarningcodes)
   - [CompileErrorCodes](#compileerrorcodes)
-- [Interface](#interface)
-  - [CompileOptions](#compileoptions)
-  - [SFCParseError](#sfcparseerror)
 - [Variable](#variable)
   - [DEFAULT_PRETTIER_OPTIONS](#default_prettier_options)
 - [Class](#class)
@@ -95,7 +94,7 @@ declare function format(source: string, filepath: string, options?: FormatOption
 Currently, only i18n custom blocks supporting
 
 
-## TypeAlias
+## Interface
 
 ### AnnotateOptions
 
@@ -103,73 +102,66 @@ Annotate options of [annotate](#annotate) function
 
 **Signature:**
 ```typescript
-declare type AnnotateOptions = {
-    type?: string;
-    force?: boolean;
-    attrs?: Record<string, any>;
-    onWarn?: (code: number, args: Record<string, any>, block: SFCBlock) => void;
-};
+interface AnnotateOptions 
 ```
 
-### FormatOptions
 
-Format options of [format](#format) function
+#### Properties
+
+##### attrs
+
+The Attributes to be annotated on the block tag
 
 **Signature:**
 ```typescript
-declare type FormatOptions = {
-    prettier?: Options;
-};
+attrs?: Record<string, any>;
 ```
 
+#### Remarks
 
-## Enum
+default as `{}`
 
-### AnnotateWarningCodes
+##### force
 
-Annotate Warning Codes
+Whether to force annotations
 
 **Signature:**
 ```typescript
-declare const enum AnnotateWarningCodes 
+force?: boolean;
 ```
 
-#### Members
-
-| Member | Value| Description |
-| --- | --- | --- |
-| LANG_MISMATCH_IN_ATTR_AND_CONTENT | 4 | Lang mismatch `lang` and block content |
-| LANG_MISMATCH_IN_OPTION_AND_CONTENT | 3 | Lang mismatch option and block content |
-| LANG_MISMATCH_IN_SRC_AND_CONTENT | 2 | Lang mismatch block `src` and block content |
-| NOT_SUPPORTED_TYPE | 1 | Not supported type |
-
 #### Remarks
 
-The warning codes of [annotate](#annotate) function
+Force annotation of the attribute values of `attrs` option to the block tag. Even if the actual `lang` of the block content in the `lang` attribute is different, it will be enforced if this flag is turned on. default as `false`
 
-### CompileErrorCodes
+##### onWarn
 
-Compile Error Codes
+The warning handler
 
 **Signature:**
 ```typescript
-declare const enum CompileErrorCodes 
+onWarn?: (code: number, args: Record<string, any>, block: SFCBlock) => void;
 ```
 
-#### Members
+#### Remarks
 
-| Member | Value| Description |
-| --- | --- | --- |
-| INTERNAL_COMPILE_ERROR | 3 | Internal compile error |
-| INTERNAL_COMPILE_WARNING | 2 | Internal compile warning |
-| NOT_SUPPORTED_FORMAT | 1 | Not supported format |
+Notify warnings generated by the annotate process
+
+##### type
+
+The type of the block
+
+**Signature:**
+```typescript
+type?: string;
+```
 
 #### Remarks
 
-The error codes of [compile](#compile) function
+Only `i18n` type is supported, if you don't specify it. If any other type is specified, the function will raise the [SFCAnnotateError](#sfcannotateerror).
 
+default as `i18n`
 
-## Interface
 
 ### CompileOptions
 
@@ -219,6 +211,32 @@ onError?: (code: number, source: string, output: string, msg?: string) => void;
 ```
 
 
+### FormatOptions
+
+Format options of [format](#format) function
+
+**Signature:**
+```typescript
+interface FormatOptions 
+```
+
+
+#### Properties
+
+##### prettier
+
+The prettier options
+
+**Signature:**
+```typescript
+prettier?: Options;
+```
+
+#### Remarks
+
+The options for formatting the content of `i18n` custom blocks with prettier default as [DEFAULT_PRETTIER_OPTIONS](#default_prettier_options)
+
+
 ### SFCParseError
 
 Vue SFC compiler error
@@ -255,6 +273,52 @@ filepath: string;
 
 
 
+## Enum
+
+### AnnotateWarningCodes
+
+Annotate Warning Codes
+
+**Signature:**
+```typescript
+declare const enum AnnotateWarningCodes 
+```
+
+#### Members
+
+| Member | Value| Description |
+| --- | --- | --- |
+| LANG_MISMATCH_IN_ATTR_AND_CONTENT | 4 | Lang mismatch `lang` and block content |
+| LANG_MISMATCH_IN_OPTION_AND_CONTENT | 3 | Lang mismatch option and block content |
+| LANG_MISMATCH_IN_SRC_AND_CONTENT | 2 | Lang mismatch block `src` and block content |
+| NOT_SUPPORTED_TYPE | 1 | Not supported type |
+
+#### Remarks
+
+The warning codes of [annotate](#annotate) function
+
+### CompileErrorCodes
+
+Compile Error Codes
+
+**Signature:**
+```typescript
+declare const enum CompileErrorCodes 
+```
+
+#### Members
+
+| Member | Value| Description |
+| --- | --- | --- |
+| INTERNAL_COMPILE_ERROR | 3 | Internal compile error |
+| INTERNAL_COMPILE_WARNING | 2 | Internal compile warning |
+| NOT_SUPPORTED_FORMAT | 1 | Not supported format |
+
+#### Remarks
+
+The error codes of [compile](#compile) function
+
+
 ## Variable
 
 ### DEFAULT_PRETTIER_OPTIONS
diff --git a/src/api/annotate.ts b/src/api/annotate.ts
index 6a29ee4..4f8894c 100644
--- a/src/api/annotate.ts
+++ b/src/api/annotate.ts
@@ -45,7 +45,7 @@ export const enum AnnotateWarningCodes {
  *
  * @public
  */
-export type AnnotateOptions = {
+export interface AnnotateOptions {
   /**
    * The type of the block
    *
diff --git a/src/api/format.ts b/src/api/format.ts
index b271bbc..c8b9527 100644
--- a/src/api/format.ts
+++ b/src/api/format.ts
@@ -14,7 +14,7 @@ const debug = createDebug('@intlify/cli:api:format')
  *
  * @public
  */
-export type FormatOptions = {
+export interface FormatOptions {
   /**
    * The prettier options
    *