An update to Day of Defeat: Source has been released. The update will be applied automatically when you restart Day of Defeat: Source. The major changes include:

• Numerous security and stability improvements

We've upgraded Day of Defeat: Source to Steam's new content delivery system!

The benefits to players are:

• Faster and smoother downloads
  
• Faster game boot times and map load times
  
• Easier distribution, installation, and management of mods

A one-time conversion process will occur the next time the game is started.

For further details, read the FAQ.