diff --git a/docs/content/b2.md b/docs/content/b2.md
index 25be69bab..c2a3b9eaa 100644
--- a/docs/content/b2.md
+++ b/docs/content/b2.md
@@ -98,7 +98,8 @@ excess files in the bucket.
 B2 supports multiple [Application Keys for different access permission
 to B2 Buckets](https://www.backblaze.com/b2/docs/application_keys.html).
 
-You can use these with rclone too.
+You can use these with rclone too; you will need to use rclone version 1.43
+or later.
 
 Follow Backblaze's docs to create an Application Key with the required
 permission and add the `Application Key ID` as the `account` and the