diff --git a/Concepts.md b/Concepts.md
index 66018c6..339594c 100644
--- a/Concepts.md
+++ b/Concepts.md
@@ -30,6 +30,8 @@ An attachment has an attachment type (see below), which groups the attachments l
 By default all uploaded files, are accessible for everyone (even non logged in users), if the link is known. If your Part-DB instance is publicly available and you want to store private/sensitve files on it, you should mark the attachment as "Private attachment". Private attachments are only accessible to users, which has the permission to access private attachments.
 Please not, that no thumbnails are generated for private attachments, which can have an performance impact.
 
+Part-DB ships some preview images for various common footprints like DIP-8 and others, as internal ressources. These can be accessed/searched by typing the keyword in the URL field of a part and choosing one of the choices from the dropdown.
+
 ## User System
 ### User
 Each person which should be able to use Part-DB (by logging in) is represented by an user entity, which defines things like access rights, the password, and other things. For security reasons, every person which will use Part-DB should use its own personal account with an secret password. This allows to track activity of the users via the log.