# 10.2.1 - :Once

Hello! Welcome back! It's been some time! 😊

Changes

Nothing too big changed, this update is backwards compatible.

1. Roblox is now releasing a new RBXScriptSignal function which will be :Once, FastSignal already implemented a similar function which was :ConnectOnce which was then even added on sleitnick's fork of GoodSignal. For API parity, it has been renamed to :Once, however you can still call :ConnectOnce.

2. :Once now returns ScriptConnection.

3. Fixed type issue where no intellisense worked on Roblox's Script Editor. Being investigated.

4. Moonwave page finally updated.

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Important notice

Because :Once hasn't actually launched, we also don't know exactly how it works.
Because of that, if :Once behaviour is not the same as the one we expect by how it works and how it is implemented here, then its current implementation here, will then be moved to :ConnectOnce and :Once will by replaced by a Lua implementation of how it works on Roblox.