Undocumented Patch

Today my Adobe Application Manager ran shortly after I started up my machine and found and applied an update to Captivate.  I checked my version number afterwards and discovered that I am now at version 5.0.3.631.  I checked Adobe's web site and looked for this update and couldn't find any reference of it anywhere.  Anyone else encounter this update?  I'd love to know what the fix or improvement was.