diff --git a/doc.zih.tu-dresden.de/README.md b/doc.zih.tu-dresden.de/README.md
index f18af80c492095f6d06f7886ba115c3aba488a75..b009dd5edc2b3f30bfd954e913176bf3a741a016 100644
--- a/doc.zih.tu-dresden.de/README.md
+++ b/doc.zih.tu-dresden.de/README.md
@@ -374,6 +374,8 @@ specific_software.md is not included in nav
 
 ## Content Rules
 
+**Remark:** Avoid using tabs both in markdown files and in `mkdocs.yaml`. Type spaces instead.
+
 ### New Page and Pages Structure
 
 The pages structure is defined in the configuration file [mkdocs.yaml](doc.zih.tu-dresden.de/mkdocs.yml).