diff --git a/index.d.ts b/index.d.ts
index 407fe1d..1d77df8 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -551,9 +551,10 @@ export namespace FontEditor {
          * convert svg font to ttf object
          * @param svg svg text
          * @param options
+         * @param options.combinePath if true, combine path to one glyph, default is false
          * @returns
          */
-        svg2ttfobject: (svg: string, options?: any) => TTF.TTFObject;
+        svg2ttfobject: (svg: string | Document, options?: {combinePath: boolean}) => TTF.TTFObject;
         /**
          * convert ttf font buffer to base64 uri
          * @param arrayBuffer ttf data
@@ -568,6 +569,7 @@ export namespace FontEditor {
          */
         ttf2icon: (arrayBuffer: ArrayBuffer | TTF.TTFObject, options?: {
             metadata: any;
+            iconPrefix?: string;
         }) => any;
         /**
          * convert ttf font buffer to woff2 font
diff --git a/package.json b/package.json
index e5062ef..e3b7f2b 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "fonteditor-core",
-  "version": "2.4.0",
+  "version": "2.4.1",
   "description": "fonts (ttf, woff, woff2, eot, svg, otf) parse, write, transform, glyph adjust.",
   "keywords": [
     "sfnt",