diff --git a/COLLABORATING.md b/COLLABORATING.md
index dc1478fe..532d80a8 100644
--- a/COLLABORATING.md
+++ b/COLLABORATING.md
@@ -180,6 +180,8 @@ When in doubt, commit more often rather than less.
 
 See [CODESTYLE.md](./CODESTYLE.md) for the full guide: Clean Code (Uncle Bob), DRY/KISS trade-offs, and SOLID principles applied to this stack.
 
+For domain terminology (Person vs AppUser, DocumentStatus lifecycle, Chronik vs Aktivität, etc.) see [docs/GLOSSARY.md](./docs/GLOSSARY.md).
+
 Quick reminders:
 - Pure functions over stateful helpers where possible
 - No premature abstractions — KISS beats DRY