diff --git a/README.md b/README.md
index b1744d4..65df8d7 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,7 @@ It clearly does not try to replace tools like [Terraform](https://www.terraform.
 - create [Ansible inventories](https://docs.ansible.com/ansible/latest/index.html)
 - resources lists in **json**
 - prototyping
+- resources costs
 ...
 - As a provider tool for other **LibreClouds** [Klouds](https://rlung.librecloud.online/LibreCloud/Klouds#klouds) tools: [CloudMandala](https://rlung.librecloud.online/LibreCloud/CloudMandala#cloudmandala) and [Zteron](https://rlung.librecloud.online/LibreCloud/CloudMandala#cloudmandala)
 
@@ -283,6 +284,12 @@ servers:
 
 ```
 
+Attributes and values are declared in [main.go](https://rlung.librecloud.online/LibreCloud/Upclapi/src/branch/master/main.go) and *yaml parsed*.
+
+A lot of definitions (__apps, tsksrvcs, cntrllrs, etc.__) are used mainly for other **LibreClouds** [Klouds](https://rlung.librecloud.online/LibreCloud/Klouds#klouds) tools: [CloudMandala](https://rlung.librecloud.online/LibreCloud/CloudMandala#cloudmandala) and [Zteron](https://rlung.librecloud.online/LibreCloud/CloudMandala#cloudmandala). These [Klouds](https://rlung.librecloud.online/LibreCloud/Klouds#klouds) tools developed in [Rust](https://www.rust-lang.org/) declare attributes and values with [Dhall language](https://dhall-lang.org/) and then converted to formats like yaml and json (so types are consistent and grouped accordly).
+
+[{...}UpClapi](https://rlung.librecloud.online/LibreCloud/Upclapi#upclapi) consumes <u>ONLY yaml</u> config/declaration files, and can be used for standalone proposal with yaml resources declaration files (in such case set empty definitions for: __apps, tsksrvcs, cntrllrs__)
+
 ## Environment
 
 Main vars: