Spanish phrase
Avísame antes de ~.
Meaning
Let me know before ___.
When to use it
Requests notification before an action. Used informally to ask a friend or family member to warn before arriving or leaving; softer than a command.
Example dialogue
Avísame antes de venir, que así abro la puerta.
Let me know before you come, and I'll open the door.
Perfecto, te aviso cuando salga.
Perfect, I'll let you know when I leave.