diff --git a/docs/policy/repo-layout-migration-2025.md b/docs/policy/repo-layout-migration-2025.md
new file mode 100644
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+++ b/docs/policy/repo-layout-migration-2025.md
@@ -0,0 +1,45 @@
+OSG Software Repo Layout Migration
+==================================
+
+11 December 2024
+
+On Monday, January 6th, 2025, the OSG Software Team will be upgrading the server that hosts the OSG Software Yum repositories
+(<https://repo.osg-htc.org> née <https://repo.opensciencegrid.org>),
+which will result in changes to the directory layout for the OSG 23 and OSG 24 Yum repos.
+
+Users installing packages should not be affected since the URLs of the repositories themselves will not change.
+However, mirror administrators will have to take some action to avoid rsyncing those repos from scratch.
+
+Perform the following steps:
+
+1.  Turn off rsync from `repo-rsync.opensciencegrid.org` or `repo-rsync.osg-htc.org`
+
+2.  Download the migration script from <https://github.com/osg-htc/osg-repo-scripts/blob/el9/migrate.py>
+    ([direct link](https://raw.githubusercontent.com/osg-htc/osg-repo-scripts/refs/heads/el9/migrate.py))
+
+3.  Run the migration script on your OSG 23 and OSG 24 Yum repositories.
+    For example, if the files on your mirror are under `/mnt/mirror/osg`, then run
+
+        :::shell
+        python3 migrate.py /mnt/mirror/osg/23-* /mnt/mirror/osg/24-*
+
+4.  Switch the rsync source to repo-rsync-itb.osg-htc.org and add `--delay-updates --delete-delay` to the rsync command.
+    For example, if your rsync command is typically
+
+        :::shell
+        rsync -av --delete \
+            repo-rsync.opensciencegrid.org::osg/ \
+            /mnt/mirror/osg
+
+    then change it to
+
+        :::shell
+        rsync -av --delay-updates --delete-delay \
+            repo-rsync-itb.osg-htc.org::osg/ \
+            /mnt/mirror/osg
+
+This will switch your mirror to the new repo layout, minimizing disruption to users.
+
+On January 6th, we will upgrade <https://repo.osg-htc.org>, at which point you should change your rsync source
+from `repo-rsync-itb.osg-htc.org` to `repo-rsync.osg-htc.org`.  We will send a reminder after the update.
+
diff --git a/mkdocs.yml b/mkdocs.yml
index 1d20e481f9..ad5bc2cea0 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -61,6 +61,7 @@ nav:
     - 'Community Testing': 'policy/community-testing.md'
     - New OSPool User Registration: 'policy/new-ospool-user.md'
     - Handling Topology/Contacts Registrations: 'policy/topology-registration.md'
+    - 'Repo Layout Migration - Jan 2025': 'policy/repo-layout-migration-2025.md'
   - Documentation:
     - Writing Documentation: 'documentation/writing-documentation.md'
     - Reviewing Documentation: 'documentation/reviewing-documentation.md'