Documentation: add more info to rotation note

diff --git a/docs/usage.md b/docs/usage.md
index e5ef3b2c0a1295187c4064068155a673b335d610..d77b3b2a6ff503c1f438c2d9d8c34dd022e67fbb 100644 (file)
--- a/docs/usage.md
+++ b/docs/usage.md
@@ -466,7 +466,7 @@ Paperless-ngx supports 3 basic editing operations for PDFs (these operations can
 
 !!! important
 
-    Note that rotation alters the Paperless-ngx original file.
+    Note that rotation alters the Paperless-ngx _original_ file, which would, for example, invalidate a digital signature.
 
 ## Best practices {#basic-searching}