diff --git a/docs/changelog.md b/docs/changelog.md
index ab4dd9d3..71635111 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -4,6 +4,8 @@
 
 ### New features
 * delete datalayer's files on delete by @yohanboniface in #2158
+  - deleted files will be moved to `UMAP_PURGATORY_ROOT`, so set this setting to
+    somewhere meaningful for your instance (default is `/tmp/umappurgatory`)
 * very minimal CSV export of users and maps in admin by @yohanboniface in #2131
 * add a setting to prevent users from editing their profile by @davidbgk in #2133
 * allow to search by code INSEE in communes importer by @yohanboniface in #2188
diff --git a/docs/config/settings.md b/docs/config/settings.md
index fbb9d0ba..481855d3 100644
--- a/docs/config/settings.md
+++ b/docs/config/settings.md
@@ -287,6 +287,8 @@ How many maps to show in the user "my maps" page.
 Path where files are moved when a datalayer is deleted. They will stay there until
 `umap purge_purgatory` is run. May be useful in case a user deletes by mistake
 a datalayer, or even a map.
+Default is `/tmp/umappurgatory/`, so beware that this folder will be deleted on
+each server restart.
 
 #### UMAP_SEARCH_CONFIGURATION