diff --git a/docs/integrations/document-import.md b/docs/integrations/document-import.md
index 0c5c54628..d7a0163f1 100644
--- a/docs/integrations/document-import.md
+++ b/docs/integrations/document-import.md
@@ -152,8 +152,15 @@ What it does:
   quick. Documents you deleted in HealthLog stay deleted, also after they
   are removed for good. The same goes for a file you had already uploaded
   by hand: the import recognises it by its content (sending it once to
-  compare), and if you delete it later, the import leaves it deleted. An
-  interrupted run simply picks up where it stopped.
+  compare), and if you delete it later, the import leaves it deleted. Since
+  v1.39.3 a deleted document is also recognised by its content while it is
+  in the 30-day undo window: the same file arriving from another system or
+  under a new id is answered "deleted" and not stored again. After the purge
+  HealthLog keeps the ids it saw, not the content. An interrupted run simply
+  picks up where it stopped.
+- Once HealthLog has refused one file as too large, the script skips any
+  further document the source already lists as larger (Papra lists sizes)
+  without downloading it.
 - When HealthLog asks it to slow down, it waits as long as HealthLog says
   and carries on. By default a document token may send 120 uploads an hour,
   so an archive of a thousand documents takes a night. Every upload that
diff --git a/docs/self-hosting/document-sources.md b/docs/self-hosting/document-sources.md
index 8b35367a0..4a30cdd2c 100644
--- a/docs/self-hosting/document-sources.md
+++ b/docs/self-hosting/document-sources.md
@@ -49,7 +49,9 @@ Settings → Integrations → Document archives:
 - **Paperless-ngx:** the base address and an API token (Paperless-ngx: My
   Profile → API token). Paperless-ngx 2.16 or later (API version 9).
 - **Papra:** the base address, the organization id (from the Papra address
-  bar) and an API key with `documents:read` and `tags:read`.
+  bar, `org_` followed by 24 letters and digits) and an API key with
+  `documents:read` and `tags:read`. The connection test reads the tags too,
+  so a key without `tags:read` is refused at save.
 
 HealthLog tests the connection before saving it. A saved token is only ever
 sent to the address it was saved for: changing the address to another origin
@@ -69,6 +71,15 @@ limit for a document).
 
 ## Limits and rules
 
+- Name search on Paperless-ngx uses its own title filter. On a Paperless-ngx
+  that stores its data in SQLite, that filter ignores upper and lower case
+  only for plain ASCII letters: searching `röntgen` does not find `Röntgen`.
+  That is Paperless-ngx's behaviour, not HealthLog's; PostgreSQL-backed
+  Paperless does not have it.
+- A document deleted in HealthLog is recognised by its content during the
+  30-day undo window, so the same file from another archive is not stored
+  again; after the purge only its ids are remembered.
+
 - Imports count against the person's normal upload allowance (60 an hour) and
   storage quota.
 - A document that is already in HealthLog is not stored twice, and one the