Update readme

slaveofcode · slaveofcode · commit ceb27e2b8279 · 2022-12-12T12:32:14.000+07:00
diff --git a/README.md b/README.md
@@ -1,19 +1,30 @@
 # FastExcel
 
+> This project need Rust to be installed, check here for [Rust installation instruction](https://www.rust-lang.org/tools/install)
+
 > This project using [Rust](https://www.rust-lang.org) and [Neon](https://neon-bindings.com) as a binding to Rust to execute fast and efficient memory usage for generating XLSX document from NodeJs. 
 
-> This project need Rust to be installed, check here for [Rust installation instruction](https://www.rust-lang.org/tools/install)
+> This project cannot be executed via NVM based NodeJs, you should deactivate (via `nvm deactivate`) and use a normal version installation of NodeJs.
+
+Writing a large amount of data into Excel file is not a trivial task when you have a limited memory (RAM) allocated. Especially when working at a small node on the server. This library is created to solve that problem, using the efficiency of Rust while generating XLSX from CSV.
 
 ### Installation
 
     npm i -D cargo-cp-artifact
 
     npm i fastexcel
 
+### How it works
+
+1. Generate the CSV
+2. Convert the CSV to XLSX
+
+The CSV generation is happen on the NodeJs side, and converting XLSX file is on Rust side (via Neon)
+
 ### Example Usage
 
-```
-// index.js
+```js
+// dummy-excel.js
 const path = require('path');
 const { CsvFileWriter, Converter } = require("fastexcel");
 
@@ -25,14 +36,14 @@ const main = async () => {
   console.log('dst', dst);
 
   const cols = [];
-  const totalCols = 200;
+  const totalCols = 200; // 200 columns
   for (let i = 0; i < totalCols; i++) {
     cols.push('Col ' + (i+1));
   }
 
   const writer = new CsvFileWriter(src, cols);
 
-  const totalRows = 1000000; // 1jt rows
+  const totalRows = 1_000_000; // 1 million rows
   for (let i = 0; i < totalRows; i++) {
     let row = [];
     
