# WATCH Marks the given keys to be watched for conditional execution of a [transaction][tt]. [tt]: /develop/interact/transactions ## Return information {{< multitabs id="watch-return-info" tab1="RESP2" tab2="RESP3" >}} [Simple string reply](../../develop/reference/protocol-spec#simple-strings): `OK`. -tab-sep- [Simple string reply](../../develop/reference/protocol-spec#simple-strings): `OK`.