Worked on enhancing the nodejs/nodejs.org repository by updating documentation to clarify the correct file extension for ECMAScript modules in Node.js. Focused on technical writing and documentation skills, the contribution addressed common developer confusion by specifying that ESM files should be saved with the .mjs extension, such as server.mjs. This update, written in Markdown, helps users avoid extension-related errors and aligns documentation with Node.js module resolution expectations. The work improved developer guidance and reduced potential support issues for those adopting ESM. No bugs were fixed during this period, with efforts concentrated on delivering a single, targeted documentation feature.