diff --git a/.docs/backup.md b/.docs/backup.md
index 238ba8e..f324e72 100644
--- a/.docs/backup.md
+++ b/.docs/backup.md
@@ -10,6 +10,14 @@ Backup allows you to export a JSON list of all of your installed repositories an
 [p]cog load backup
 ```
 
+## Version Compatibility
+
+As of commit [1edb08a](https://www.coastalcommits.com/SeaswimmerTheFsh/SeaCogs/commit/1edb08a1271f12098ca0bed11a735f7162cedd14), the Backup cog no longer supports Red versions older than 3.5.6. If you want to use the cog on an earlier version (3.5.0 - 3.5.5), install the cog pinned to this commit: `43464db6a7c51bc69282b1ae3dc507a4aae851de`.
+
+```bash
+[p]cog installversion sea-cogs 43464db6a7c51bc69282b1ae3dc507a4aae851de backup
+```
+
 ## Commands
 
 ### backup export