Try this
- Identify the mistaken detail and the replacement. Use the conversation’s supported correction method and consider whether a separate update is needed.
- Keep the correction concise so the current instruction or plan is easy to find.
A worked example
“Correction to my last message: the train arrives at 6:40, not 6:10. Please use 6:40 for the pickup plan.”
An invented example to adapt, not a real exchange or a script you have to follow.
Before you leave it here
Verify the corrected detail before sending again. An edit may not notify every recipient, so do not assume silent editing is sufficient for a time-sensitive change.