diff --git a/source/includes/options-mongorestore.yaml b/source/includes/options-mongorestore.yaml
index 2117127b35d..3cc50e77e25 100644
--- a/source/includes/options-mongorestore.yaml
+++ b/source/includes/options-mongorestore.yaml
@@ -224,6 +224,14 @@ args: null
 description: |
   Modifies the restoration procedure to drop every collection from the
   target database before restoring the collection from the dumped backup.
+
+  .. important::
+     When ``--drop`` is specified, all users are removed and replaced with
+     users defined in the dump file to be restored. Therefore if the user
+     credentials specified as arguments to :program:`mongorestore` do not
+     correspond to a user that exists in the dump file, the restoration process
+     will fail, leaving an empty database.
+
 optional: true
 ---
 program: mongorestore