How to view documentation for user-defined script routines in code completion panel

When writing a script test, the code completion panel shows a brief description of built-in functions, including the types of parameters and return values, as seen in this image.

Is there any way I can make TestComplete show a similar description, including function signature, for user defined functions?

At the moment, all I'm seeing in the code completion panel for user-defined functions is a generic method signature, where all parameters and return types are listed as 'Object'. How can I change the signature shown here, and also add a description?