Maybe i misunderstood your request.
The IDE Comment=my comment, in the manifest.txt file which is included in the b4xlib is displayed in the Libraries Manager Tab.
Be aware to have no empty character between IDE Comment and the '=' sign, which seems not being the case in your project.
If it is not the case, there is something wrong in your code or file content.
But, without knowing what exactly you have done and how, it is impossible to give any concrete advice.