diff --git a/admin_manual/installation/server_tuning.rst b/admin_manual/installation/server_tuning.rst
index 0510877f2..45ca9d781 100644
--- a/admin_manual/installation/server_tuning.rst
+++ b/admin_manual/installation/server_tuning.rst
@@ -168,6 +168,11 @@ external microservice: `Imaginary <https://github.com/h2non/imaginary>`_.
    Imaginary is currently incompatible with server-side-encryption. 
    See https://github.com/nextcloud/server/issues/34262
 
+.. warning::
+
+   Imaginary is currently known to have issues with HEIC images.
+   See https://github.com/nextcloud/server/issues/35643
+
 We strongly recommend running our custom docker image that is more up to date than the official image.
 You can find the image at `docker.io/nextcloud/aio-imaginary:latest`.