diff --git a/Developer-documentation.md b/Developer-documentation.md
index e62914a..fd7c937 100644
--- a/Developer-documentation.md
+++ b/Developer-documentation.md
@@ -133,4 +133,12 @@ This module provides the web UI for the users.
 ## Trying out our webshop
 Since our webshop is a modern web application, it has quite a few dependencies. To make trying it out easier, we deployed the web application to our own secure Kubernetes cluster. It is available at [unstablevortex.kmlabz.com](https://unstablevortex.kmlabz.com).
 
-The application connects to every dependency (Minio, CAFF previewer wrapper, SMTP and PostgreSQL server) over TLS and the configuration environment variables are stored in [Vault](https://www.vaultproject.io/docs/what-is-vault). 
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+The application connects to every dependency (Minio, CAFF previewer wrapper, SMTP and PostgreSQL server) over TLS and the configuration environment variables are stored in [Vault](https://www.vaultproject.io/docs/what-is-vault).
+
+## Integrity checking
+
+The function that is responsible for the preview creation (`create_caff_preview` in `src/utils/caff_previewer.py`) validates the response for the following:
+
+- integrity (2-way)
+- MIME type
+- size
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