A Check-In Comment Is Not Recorded in the Revision History (Visual SourceSafe)
When you check in a package, folder, or element, a Check In Comment dialog box appears, enabling you to type a comment on the nature of the check in. When you view the revision history for the element, the comment is not present.
Possible Cause
In Visual SourceSafe, the default check in behavior is to cancel the check in for unchanged files. Therefore, Visual SourceSafe disregards the comment you entered when you check in an unchanged file. The comment is applied when you check in a modified file.
Solution
Configure Visual SourceSafe to check in unchanged files. In Visual SourceSafe 6.0, this is done from the Tools > Options menu; on the SourceSafe Options dialog box, click the General tab. Set the value for Check in unchanged files to Check In.