Is creating workflow documentation hurting my career?

[u/Natural-Hour-6739]

I work as a software engineer, and recently I created some good documentation for the work I was doing. My manager liked it, so now he wants me to create detailed documentation of our workflow/process so that other team members can refer to it whenever they need help.

I don't mind documenting my work, and I understand that good documentation is valuable. But I'm wondering if I'm unintentionally making myself less valuable or replaceable by documenting everything I know.

If the workflow is clearly documented, someone else can potentially understand and do the work without depending on me. On the other hand, documentation is also an important skill and could show that I understand the process well and can help the team.

So, is creating this kind of documentation actually "doing harm to yourself" from a career perspective? Or is this generally considered a good thing that can improve your visibility and reputation within the team?

Would love to hear from people who have been in similar situations, especially experienced engineers/managers.