Hi Everyone,
Workflow action Comments are now live to all customers 
We’re actively working on adding @ mentioning capabilities to this feature, so keep an eye out for that coming soon.
We’re also working with other teams as HubSpot to enable a workflow-level commenting system, that’s not tied to any specific action, but rather references the workflow itself as a whole.
Follow up question for feedback: Currently, workflow action level comments will not carry over if a workflow is cloned. If anyone has thoughts about this (is that good? bad? why?) I’d love to hear more from you, please comment or send me a direct message.
Thank you!
Megan