diff --git a/API.md b/API.md
index 73c7479..deeb009 100644
--- a/API.md
+++ b/API.md
@@ -27,7 +27,7 @@ crls | Array\<Uint8Array\> | optional | The array of [CRL](#note)s.
 
 Name | Type | Attributes | Description
 --- | --- | --- | ---
-mode | [Crypto.Mode](#Crypto.Mode) | required | The mode of encryption
+mode | [Crypto.Mode](#CryptoMode) | required | The mode of encryption
 permissions | Array\<string\> | optional | The set of permissions to be blocked :one:
 userpwd | string | optional | User password. Used when opening the pdf.
 ownerpwd | string | optional | Owner password. If not specified, a random value is used.
@@ -60,8 +60,43 @@ Name | Type | Attributes | Description
 --- | --- | --- | ---
 x | number | required | Distance from left
 y | number | required | Distance from top
-w | number | required | Width
-h | number | required | Height
+w | number | optional | Width
+h | number | optional | Height
+
+## SignTextInfo
+:taco::taco::taco:
+
+Name | Type | Attributes | Description
+--- | --- | --- | ---
+text | string | required | A text to draw.
+size | number | required | Font size
+fontData | Array\<number\><br />:fork_and_knife:Uint8Array<br />:fork_and_knife:ArrayBuffer<br />:fork_and_knife:string | optional | The font's data for drawing text.<br />If it is a string, it is assumed to be one of the values in [PDFLib.StandardFonts](https://pdf-lib.js.org/docs/api/enums/standardfonts)<br />Default: `StandardFonts.Helvetica`
+color | string | optional | A Hex string of font color. :one:<br />Default: `#000`
+opacity | number | optional | Valid value is from 0 to 1.<br />Default: `1`<br />:no_entry_sign:<ins>Not implemented yet</ins>
+blendMode | string | optional | Valid value is one of the values in [PDFLib.BlendMode](https://pdf-lib.js.org/docs/api/enums/blendmode)<br />:no_entry_sign:<ins>Not implemented yet</ins>
+lineHeight | number | optional | Default is the height of the font at the given size.
+xOffset | number | optional | An offset from [SignAreaInfo](#signareainfo)'s x.
+yOffset | number | optional | An offset from [SignAreaInfo](#signareainfo)'s y.
+wMax | number | optional | The max width for drawing text.
+align | number | optional | Alignment of text. :two:<br />Default is `0`.
+noBreaks | string | optional | A regular expression string that indicates which characters should not be used to break a word.<br />Default: `[A-Za-z0-9]`
+
+:one: Value of `color` can be [6-digit](https://htmlcolorcodes.com/) or 3-digit. And `#` can be omitted.
+
+:two: `align` can be the values listed blow.
+  * `0`: left
+  * `1`: center
+  * `2`: right
+
+## SignImageInfo
+:taco::taco::taco:
+
+Name | Type | Attributes | Description
+--- | --- | --- | ---
+imgData | Array\<number\><br />:fork_and_knife:Uint8Array<br />:fork_and_knife:ArrayBuffer<br />:fork_and_knife:string | required | The image's data.
+imgType | string | required | The image's type, <ins>only support jpg and png</ins>
+opacity | number | optional | Valid value is from 0 to 1.<br />Default: 1<br />:no_entry_sign:<ins>Not implemented yet</ins>
+blendMode | string | optional | Valid value is one of the values in [PDFLib.BlendMode](https://pdf-lib.js.org/docs/api/enums/blendmode)<br />:no_entry_sign:<ins>Not implemented yet</ins>
 
 ## SignDrawInfo
 :taco::taco::taco:
@@ -69,11 +104,13 @@ h | number | required | Height
 Name | Type | Attributes | Description
 --- | --- | --- | ---
 area | [SignAreaInfo](#signareainfo) | required | The signature's drawing area, these numbers are dots on 72dpi.
-pageidx | number | optional | The index of a page where the signature will be drawn. Default is 0.
-imgData | Array\<number\><br />:fork_and_knife:Uint8Array<br />:fork_and_knife:ArrayBuffer<br />:fork_and_knife:string | optional | The image's data.
-imgType | string | optional | The image's type, <ins>only support jpg and png</ins>
-text | string| optional | A text drawing for the signature, <ins>not implemented yet</ins>
-fontData | PDFLib.StandardFonts<br />:fork_and_knife:Array\<number\><br />:fork_and_knife:Uint8Array<br />:fork_and_knife:ArrayBuffer<br />:fork_and_knife:string | optional | The font's data for drawing text, <ins>not implemented yet</ins>
+pageidx | number<br />:fork_and_knife:string | optional | The index of a page where the signature will be placed.<br />A string can be used to indicate placing the signature on multiple pages. :one:<br />Default is `0`.
+~~imgData~~ | Array\<number\><br />:fork_and_knife:Uint8Array<br />:fork_and_knife:ArrayBuffer<br />:fork_and_knife:string | optional | The image's data.<br />:x:**Deprecated**, use `imgInfo` instead.
+~~imgType~~ | string | optional | The image's type, <ins>only support jpg and png</ins><br />:x:**Deprecated**, use `imgInfo` instead.
+imgInfo | [SignImageInfo](#signimageinfo) | optional | Image's informations for drawing.
+textInfo | [SignTextInfo](#signtextinfo) | optional | Text's informations for drawing.
+
+:one: For example: A pdf contains 17 pages and specify `"-3,5-7,9,12,15-"` to `pageidx` means `[0,1,2,3,5,6,7,9,12,15,16]`.
 
 ## SignOption
 :taco::taco::taco: