I'm using the Hierarchy Manager in context that we need exactly this, and I was studying the code. Looking into it I realizes a small typo in the fieldset "Setup Plugin Settings" on #description
. It's wrote as descrption
and for this reason the description isn't appearing in the form build
admin/config/user-interface/hierarchy_manager/config
Setup plugin advanced settings
Adjust the key #description in the form HMConfigForm will be enough
Fixed
3.0
Code