diff --git a/doc/forum/How_to_get_a_list_of_all_NOT_unused_files.mdwn b/doc/forum/How_to_get_a_list_of_all_NOT_unused_files.mdwn
index 2c4b1a3289..45af5b2ee6 100644
--- a/doc/forum/How_to_get_a_list_of_all_NOT_unused_files.mdwn
+++ b/doc/forum/How_to_get_a_list_of_all_NOT_unused_files.mdwn
@@ -15,4 +15,6 @@ However, git annex exits without copying any files, my repo is still empty after
 
 I also tried git annex findkeys --not --unused, but it says invalid option --unused :-(
 
+In my example I have multiple repositories that all have part of the files I want, so I cannot just make a repo that has all versions of all files and then `drop --unused`. That also would take too much storage.
+
 How can I do this?