During January 2026, Charles Muithi focused on improving documentation accuracy for the medusajs/medusa repository, specifically targeting the PostHog integration workflow. He identified and corrected an incorrect API Key documentation link, updating the relevant Markdown files to ensure developers are directed to the proper integration guidance. By refining the technical writing and documentation structure, Charles reduced onboarding friction and minimized potential integration errors for new users. His work, primarily using Markdown and leveraging his documentation and technical writing skills, addressed a specific pain point in the developer experience, resulting in clearer guidance and likely reducing future support queries related to PostHog.