Visual Basic for Applications Reference
Returns or sets a string expression containing a descriptive string associated with an object. Read/write.
For the Err object, returns or sets a descriptive string associated with an error.
The Description property setting consists of a short description of the error. Use this property to alert the user to an error that you either can't or don't want to handle. When generating a user-defined error, assign a short description of your error to the Description property. If Description isnt filled in, and the value of Number corresponds to a Visual Basic run-time error, the string returned by the Error function is placed in Description when the error is generated.