diff --git a/doc/FORMAT.md b/doc/FORMAT.md
index 88abcd8e4..c832a4bdd 100644
--- a/doc/FORMAT.md
+++ b/doc/FORMAT.md
@@ -17,3 +17,4 @@
 - Save **all** options instead of the piecemeal saves that are done now.  These options are for informational purposes only so it would be fine to save them in a KeyValue or JSON blob.
 
 - Store default sections before file/link/path sections to avoid two passes on load.
+- Format backup labels using gmtime().