First of all thank you for creating such useful tool! I think this is a wild shot but I think I have a suggestion:

What problem are you facing?

Our pre-commit hook uses terraform-docs to generate documentation for all Terraform modules in the repository, the command used is

terraform-docs markdown --recursive --output-file README.md /src/terraform

This repository contains hundreds of modules, and the --recursive option causes a significant delay during each commit. We suspect the modules are processed sequentially, and we'd like to explore ways to improve performance.

How could terraform-docs help solve your problem?

It would be great if each module was processed in parallel even with a small-ish pool of worker threads / goroutines. I think this would greatly reduce the noticeable wait time for my use case.