After a measurable achievement
Add achievements while the numbers, context, and outcome are still easy to remember. The best CV bullets often depend on specific detail: how many customers you supported, what system you improved, how much time you saved, what deadline you met, what risk you reduced, or what result the project achieved.
A weak update says, “Worked on reporting improvements.” A stronger update says, “Built a weekly reporting tracker that reduced manual status updates for five team leads and gave managers clearer visibility of overdue tasks.” Even if you do not have a perfect metric, capture the scale and result while it is fresh.
Create a habit of writing achievement notes at the end of projects, busy periods, placements, campaigns, audits, events, or training cycles. You can refine the wording later. The first job is to save the evidence.