diff --git a/doc/user/group/import/index.md b/doc/user/group/import/index.md
index 2c26b3cf38d3b24da838de3cdcbaf17eded4b0fa..42a3ce32e8981b8354e386d6d3a0d9cbc4b0ecd5 100644
--- a/doc/user/group/import/index.md
+++ b/doc/user/group/import/index.md
@@ -59,8 +59,8 @@ groups are in the same GitLab instance. Transferring groups is a faster and more
 
 ## Known issues
 
-See [epic 6629](https://gitlab.com/groups/gitlab-org/-/epics/6629) for a list of known issues for migrating by direct
-transfer.
+- Because of [issue 406685](https://gitlab.com/gitlab-org/gitlab/-/issues/406685), files with a file name longer than 255 characters are not migrated.
+- For a list of other known issues, see [epic 6629](https://gitlab.com/groups/gitlab-org/-/epics/6629).
 
 ## Estimating migration duration