- The defects that were fixed by the update
- Client program compatibility (if the update is applied to the server, is it mandatory to update the client programs as well?)


Hi Naoki Hirai ,
The Tridion Docs 15.2.1 release announcement was published on the community.
Please see Tridion Docs February Update is Out! (version 15.2.1)
Links to release notes are mentioned there.
I will include them here as well:
Hi Andriy Zhidko ,
I read through the blog post and release notices. I realized that many issues have been solved, so I feel it is worth applying the update as soon as possible.
Thanks a lot!!
Best regards,
Naoki