diff --git a/doc/feature_001.md b/doc/feature_001.md
index cd2babb..61ee4f3 100644
--- a/doc/feature_001.md
+++ b/doc/feature_001.md
@@ -118,4 +118,15 @@
 - When David accepts the invitation
 - Then he becomes a member of the salon
 - When David declines the invitation
-- Then Bob is notified of the refusal
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+- Then Bob is notified of the refusal
+
+
+
+# Technical Constraints
+
+- **.NET**: Main framework for backend, API, and business logic.
+- **Angular**: Framework used for developing the interactive web frontend.
+- **Docker**: Containerization of services to facilitate deployment and portability.
+- **Logto**: Authentication and identity management solution to secure access.
+- **SQLite**: Lightweight database, ideal for local storage or testing environments.
+- **Hetzner**: Hosting provider for production deployment (servers, cloud).
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