diff --git a/README.md b/README.md
index 1e73e16..4f41dbf 100644
--- a/README.md
+++ b/README.md
@@ -43,9 +43,9 @@ cd latex2image-web/
 npm install
 ```
 
-### Global Node.js packages for non-SVG images
+### (Optional) Global Node.js packages for non-SVG images
 
-SVG files can be generated as-is, but for PNG and JPG export support two global Node.js packages [svgexport](https://www.npmjs.com/package/svgexport) and [imagemin-cli](https://www.npmjs.com/package/imagemin-cli) are required:
+SVG files can be generated as-is, but for PNG and JPG export support, two global Node.js packages [svgexport](https://www.npmjs.com/package/svgexport) and [imagemin-cli](https://www.npmjs.com/package/imagemin-cli) are required:
 
 ```
 npm install svgexport -g